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bors a77322c16f Auto merge of #118310 - scottmcm:three-way-compare, r=davidtwco 
Add `Ord::cmp` for primitives as a `BinOp` in MIR

Update: most of this OP was written months ago.  See https://github.com/rust-lang/rust/pull/118310#issuecomment-2016940014 below for where we got to recently that made it ready for review.

---

There are dozens of reasonable ways to implement `Ord::cmp` for integers using comparison, bit-ops, and branches.  Those differences are irrelevant at the rust level, however, so we can make things better by adding `BinOp::Cmp` at the MIR level:

1. Exactly how to implement it is left up to the backends, so LLVM can use whatever pattern its optimizer best recognizes and cranelift can use whichever pattern codegens the fastest.
2. By not inlining those details for every use of `cmp`, we drastically reduce the amount of MIR generated for `derive`d `PartialOrd`, while also making it more amenable to MIR-level optimizations.

Having extremely careful `if` ordering to μoptimize resource usage on broadwell (#63767) is great, but it really feels to me like libcore is the wrong place to put that logic.  Similarly, using subtraction [tricks](https://graphics.stanford.edu/~seander/bithacks.html#CopyIntegerSign) (#105840) is arguably even nicer, but depends on the optimizer understanding it (https://github.com/llvm/llvm-project/issues/73417) to be practical.  Or maybe [bitor is better than add](https://discourse.llvm.org/t/representing-in-ir/67369/2?u=scottmcm)?  But maybe only on a future version that [has `or disjoint` support](https://discourse.llvm.org/t/rfc-add-or-disjoint-flag/75036?u=scottmcm)?  And just because one of those forms happens to be good for LLVM, there's no guarantee that it'd be the same form that GCC or Cranelift would rather see -- especially given their very different optimizers.  Not to mention that if LLVM gets a spaceship intrinsic -- [which it should](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Suboptimal.20inlining.20in.20std.20function.20.60binary_search.60/near/404250586) -- we'll need at least a rustc intrinsic to be able to call it.

As for simplifying it in Rust, we now regularly inline `{integer}::partial_cmp`, but it's quite a large amount of IR.  The best way to see that is with 8811efa88b (diff-d134c32d028fbe2bf835fef2df9aca9d13332dd82284ff21ee7ebf717bfa4765R113) -- I added a new pre-codegen MIR test for a simple 3-tuple struct, and this PR change it from 36 locals and 26 basic blocks down to 24 locals and 8 basic blocks.  Even better, as soon as the construct-`Some`-then-match-it-in-same-BB noise is cleaned up, this'll expose the `Cmp == 0` branches clearly in MIR, so that an InstCombine (#105808) can simplify that to just a `BinOp::Eq` and thus fix some of our generated code perf issues.  (Tracking that through today's `if a < b { Less } else if a == b { Equal } else { Greater }` would be *much* harder.)

---

r? `@ghost`
But first I should check that perf is ok with this
~~...and my true nemesis, tidy.~~
2024-04-02 19:21:44 +00:00
..
auxiliary Also move the auxiliary file 2023-03-20 10:25:29 +00:00
avr [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cffi compiletest: Add a //@ needs-threads directive 2024-03-06 12:35:07 -08:00
cross-crate-inlining [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-accessibility [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
dllimports [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
enum Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
instrument-coverage Remove unhelpful DEFINE_INTERNAL from filecheck flags 2024-02-23 11:29:01 +11:00
instrument-xray [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
intrinsics Auto merge of #118310 - scottmcm:three-way-compare, r=davidtwco 2024-04-02 19:21:44 +00:00
issues Update the minimum external LLVM to 17 2024-03-17 10:11:04 -07:00
lib-optimizations Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
loongarch-abi add -O to some tests which depend on attributes being added 2024-03-10 16:04:12 -04:00
macos [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
meta-filecheck Allow tests to specify a //@ filecheck-flags: header 2024-02-23 11:28:06 +11:00
naked-fn [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
non-terminate [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
remap_path_prefix [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
repr add -O to some tests which depend on attributes being added 2024-03-10 16:04:12 -04:00
riscv-abi [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
sanitizer Auto merge of #123071 - rcvalle:rust-cfi-fix-method-fn-ptr-cast, r=compiler-errors 2024-03-29 09:04:05 +00:00
simd Restore the test checks for wider_reduce_into_iter 2024-03-28 21:28:45 +08:00
simd-intrinsic fix use of platform_intrinsics in tests 2024-02-25 08:15:44 +01:00
src-hash-algorithm [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unwind-abis Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
aarch64-struct-align-128.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-efiapi.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-main-signature-16bit-c-int.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-main-signature-32bit-c-int.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
abi-repr-ext.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-sysv64.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-x86-interrupt.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
abi-x86_64_sysv.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
addr-of-mutate.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
adjustments.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
align-byval-alignment-mismatch.rs copy byval argument to alloca if alignment is insufficient 2024-03-11 09:38:54 -04:00
align-byval-vector.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
align-byval.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
align-enum.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
align-fn.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
align-offset.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
align-struct.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
alloc-optimisation.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
array-clone.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
array-codegen.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
array-equality.rs Use generic NonZero in tests. 2024-02-25 12:03:48 +01:00
array-map.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
array-optimized.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
ascii-char.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
asm-clobber_abi.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-clobbers.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-goto.rs Add tests for asm goto 2024-02-24 19:49:16 +00:00
asm-may_unwind.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-maybe-uninit.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-multiple-options.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-options.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-powerpc-clobbers.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-sanitize-llvm.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
asm-target-clobbers.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
async-closure-debug.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
async-fn-debug-awaitee-field.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
async-fn-debug-msvc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
async-fn-debug.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
atomic-operations.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
autovectorize-f32x4.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
binary-search-index-no-bound-check.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
bool-cmp.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
box-uninit-bytes.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
bpf-alu32.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
branch-protection.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
call-llvm-intrinsics.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
call-metadata.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
catch-unwind.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cdylib-external-inline-fns.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cf-protection.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cfguard-checks.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cfguard-disabled.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cfguard-nochecks.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cfguard-non-msvc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
char-ascii-branchless.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
codemodels.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
coercions.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
cold-call-declare-and-call.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
common_prim_int_ptr.rs refine common_prim test 2024-03-13 01:17:15 -04:00
comparison-operators-2-tuple.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
comparison-operators-newtype.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
const_scalar_pair.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
constant-branch.rs Use br instead of conditional when branching on constant 2024-02-23 10:52:55 +00:00
consts.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
coroutine-debug-msvc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
coroutine-debug.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
dealloc-no-unwind.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-alignment.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-column-msvc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-column.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-compile-unit-path.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-fndef-size.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-limited.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-line-directives-only.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-line-tables-only.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-linkage-name.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debug-vtable.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debuginfo-constant-locals.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debuginfo-generic-closure-env-names.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
debuginfo-inline-callsite-location.rs Update a test to support Symbol Mangling V0 2024-02-26 18:12:07 +01:00
deduced-param-attrs.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
default-hidden-visibility.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
default-requires-uwtable.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
direct-access-external-data.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
dont_codegen_private_const_fn_only_used_in_const_eval.rs Stop walking the bodies of statics for reachability, and evaluate them instead 2024-03-14 14:10:45 +00:00
drop-in-place-noalias.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
drop.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
dst-offset.rs use ptradd for vtable indexing 2024-03-10 22:47:30 -04:00
dst-vtable-align-nonzero.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
dst-vtable-size-range.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
ehcontguard_disabled.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
ehcontguard_enabled.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
enable-lto-unit-splitting.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
export-no-mangle.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
external-no-mangle-fns.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
external-no-mangle-statics.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
fastcall-inreg.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
fatptr.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
fewer-names.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
float_math.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
fn-impl-trait-self.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
foo.s Move /src/test to /tests 2023-01-11 09:32:08 +00:00
force-frame-pointers.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
force-no-unwind-tables.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
force-unwind-tables.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
frame-pointer.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
function-arguments-noopt.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
function-arguments.rs Auto merge of #122050 - erikdesjardins:sret, r=nikic 2024-03-11 04:45:27 +00:00
function-return.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
gdb_debug_script_load.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
generic-debug.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
global_asm.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
global_asm_include.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
global_asm_x2.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
i128-x86-align.rs always use gep inbounds i8 (ptradd) for field offsets 2024-02-26 22:28:09 -05:00
infallible-unwrap-in-opt-z.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
inherit_overflow.rs Codegen const panic messages as function calls 2024-03-22 09:55:50 -04:00
inline-always-works-always.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
inline-debuginfo.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
inline-function-args-debug-info.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
inline-hint.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
instrument-mcount.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
integer-cmp.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
integer-overflow.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
internalize-closures.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
intrinsic-no-unnamed-attr.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
is_val_statically_known.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
issue-97217.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
iter-repeat-n-trivial-drop.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
layout-size-checks.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
lifetime_start_end.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
link-dead-code.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
link_section.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
llvm-ident.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
llvm_module_flags.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
loads.rs Don't emit load metadata in debug mode 2024-03-25 18:32:45 +00:00
local-generics-in-exe-internalized.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
lto-removes-invokes.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
mainsubprogram.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
mainsubprogramstart.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
match-optimized.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
match-optimizes-away.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
match-unoptimized.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
maybeuninit-rvo.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
mem-replace-big-type.rs use [N x i8] for byval/sret types 2024-03-05 18:54:45 -05:00
mem-replace-simple-type.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
merge-functions.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
method-declaration.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
mir-inlined-line-numbers.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
mir_zst_stores.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
move-before-nocapture-ref-arg.rs Update the minimum external LLVM to 17 2024-03-17 10:11:04 -07:00
move-operands.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
no-assumes-on-casts.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
no-dllimport-w-cross-lang-lto.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
no-jump-tables.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
no-plt.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
no_builtins-at-crate.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-box-off.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-box.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-flag.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-refcell.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-rwlockreadguard.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noalias-unpin.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noreturn-uninhabited.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
noreturnflag.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nounwind.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
nrvo.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
optimize-attr-1.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
option-as-slice.rs Remove an obsolete ignore-llvm-version 2024-03-17 10:52:00 -07:00
option-niche-eq.rs Remove SpecOptionPartialEq 2024-03-19 16:32:01 +00:00
overaligned-constant.rs Don't emit load metadata in debug mode 2024-03-25 18:32:45 +00:00
packed.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
panic-abort-windows.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
panic-in-drop-abort.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
panic-unwind-default-uwtable.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
personality_lifetimes.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
pgo-counter-bias.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
pgo-instrumentation.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
pic-relocation-model.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
pie-relocation-model.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
precondition-checks.rs Avoid lowering code under dead SwitchInt targets 2024-03-12 19:01:04 -04:00
ptr-arithmetic.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
ptr-read-metadata.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
README.md Move /src/test to /tests 2023-01-11 09:32:08 +00:00
refs.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
repeat-trusted-len.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
scalar-pair-bool.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
set-discriminant-invalid.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
skip-mono-inside-if-false.rs Avoid lowering code under dead SwitchInt targets 2024-03-12 19:01:04 -04:00
slice-as_chunks.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-indexing.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-init.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
slice-iter-fold.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-iter-len-eq-zero.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-iter-nonnull.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-position-bounds-check.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
slice-ref-equality.rs Use generic NonZero in tests. 2024-02-25 12:03:48 +01:00
slice-reverse.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
slice-windows-no-bounds-check.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
slice_as_from_ptr_range.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
some-abis-do-extend-params-to-32-bits.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
some-global-nonnull.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
sparc-struct-abi.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
split-lto-unit.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
sroa-fragment-debuginfo.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
sse42-implies-crc32.rs Rollup merge of #120820 - CKingX:cpu-base-minimum, r=petrochenkov,ChrisDenton 2024-02-29 17:08:36 +01:00
stack-probes-inline.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
stack-protector.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
static-relocation-model-msvc.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
staticlib-external-inline-fns.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
stores.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
swap-large-types.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
swap-small-types.rs Let codegen decide when to mem::swap with immediates 2024-03-17 11:59:18 -07:00
target-cpu-on-functions.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
target-feature-inline-closure.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
target-feature-overrides.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
thin-lto.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
thread-local.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
tied-features-strength.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
to_vec.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
trailing_zeros.rs Update the minimum external LLVM to 17 2024-03-17 10:11:04 -07:00
transmute-optimized.rs Use generic NonZero in tests. 2024-02-25 12:03:48 +01:00
transmute-scalar.rs Lower transmutes from int to pointer type as gep on null 2024-03-11 18:19:17 -04:00
try_identity.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
try_question_mark_nop.rs allow using scalarpair with a common prim of ptr/ptr-sized-int 2024-02-27 00:09:12 -05:00
tune-cpu-on-functions.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
tuple-layout-opt.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unchecked-float-casts.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unchecked_shifts.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
uninit-consts.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
union-abi.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unwind-and-panic-abort.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unwind-extern-exports.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
unwind-extern-imports.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
unwind-landingpad-cold.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
unwind-landingpad-inline.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
used_with_arg.rs Move /src/test to /tests 2023-01-11 09:32:08 +00:00
var-names.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
vec-as-ptr.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
vec-calloc.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-in-place.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-iter-collect-len.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-iter.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-optimizes-away.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-reserve-extend.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vec-shrink-panik.rs Update the minimum external LLVM to 17 2024-03-17 10:11:04 -07:00
vec-with-capacity.rs try_with_capacity for Vec, VecDeque, String 2024-03-01 18:24:02 +00:00
vec_pop_push_noop.rs Fix test. 2024-03-29 15:37:43 -07:00
vecdeque-drain.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vecdeque-nonempty-get-no-panic.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vecdeque_no_panic.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
virtual-function-elimination-32bit.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
virtual-function-elimination.rs Ignore less tests in debug builds 2024-02-23 18:04:01 -05:00
vtable-upcast.rs use ptradd for vtable indexing 2024-03-10 22:47:30 -04:00
wasm_casts_trapping.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
wasm_exceptions.rs Update test directives for wasm32-wasip1 2024-03-11 09:36:35 -07:00
zip.rs [AUTO_GENERATED] Migrate compiletest to use ui_test-style //@ directives 2024-02-22 16:04:04 +00:00
zst-offset.rs use GEP inbounds for ZST and DST field offsets 2024-03-04 09:32:33 -05:00

README.md

The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb