54 lines
1.9 KiB
Rust
54 lines
1.9 KiB
Rust
//@ only-x86_64
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//@ assembly-output: emit-asm
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//@ compile-flags: --crate-type=lib -O -C target-cpu=x86-64-v4
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//@ compile-flags: -C llvm-args=-x86-asm-syntax=intel
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#![no_std]
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#![feature(bigint_helper_methods)]
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// This checks that the `carrying_add` and `borrowing_sub` implementation successfully chain,
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// to catch issues like <https://github.com/rust-lang/rust/issues/85532#issuecomment-2495119815>
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// This forces the ABI to avoid the windows-vs-linux ABI differences.
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// CHECK-LABEL: bigint_chain_carrying_add:
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#[no_mangle]
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pub unsafe extern "sysv64" fn bigint_chain_carrying_add(
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dest: *mut u64,
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src1: *const u64,
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src2: *const u64,
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n: usize,
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mut carry: bool,
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) -> bool {
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// CHECK: mov [[TEMP:r..]], qword ptr [rsi + 8*[[IND:r..]] + 8]
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// CHECK: adc [[TEMP]], qword ptr [rdx + 8*[[IND]] + 8]
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// CHECK: mov qword ptr [rdi + 8*[[IND]] + 8], [[TEMP]]
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// CHECK: mov [[TEMP]], qword ptr [rsi + 8*[[IND]] + 16]
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// CHECK: adc [[TEMP]], qword ptr [rdx + 8*[[IND]] + 16]
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// CHECK: mov qword ptr [rdi + 8*[[IND]] + 16], [[TEMP]]
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for i in 0..n {
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(*dest.add(i), carry) = u64::carrying_add(*src1.add(i), *src2.add(i), carry);
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}
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carry
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}
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// CHECK-LABEL: bigint_chain_borrowing_sub:
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#[no_mangle]
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pub unsafe extern "sysv64" fn bigint_chain_borrowing_sub(
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dest: *mut u64,
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src1: *const u64,
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src2: *const u64,
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n: usize,
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mut carry: bool,
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) -> bool {
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// CHECK: mov [[TEMP:r..]], qword ptr [rsi + 8*[[IND:r..]] + 8]
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// CHECK: sbb [[TEMP]], qword ptr [rdx + 8*[[IND]] + 8]
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// CHECK: mov qword ptr [rdi + 8*[[IND]] + 8], [[TEMP]]
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// CHECK: mov [[TEMP]], qword ptr [rsi + 8*[[IND]] + 16]
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// CHECK: sbb [[TEMP]], qword ptr [rdx + 8*[[IND]] + 16]
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// CHECK: mov qword ptr [rdi + 8*[[IND]] + 16], [[TEMP]]
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for i in 0..n {
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(*dest.add(i), carry) = u64::borrowing_sub(*src1.add(i), *src2.add(i), carry);
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}
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carry
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}
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