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Rollup merge of #130325 - workingjubilee:plus-minus-zero-redux, r=RalfJung,jieyouxu

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Use -0.0 in `intrinsics::simd::reduce_add_unordered`

-0.0 is the actual neutral additive float, not +0.0, and this matters to codegen.

try-job: aarch64-gnu
This commit is contained in:
Jubilee
2024-09-15 23:51:25 -07:00
committed by GitHub
parent 0151cbe6e8 ab8c202527
commit 68758c0560
2 changed files with 31 additions and 2 deletions
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4
compiler/rustc_codegen_llvm/src/intrinsic.rs
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@@ -2066,14 +2066,14 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
};
}
arith_red!(simd_reduce_add_ordered: vector_reduce_add, vector_reduce_fadd, true, add, 0.0);
arith_red!(simd_reduce_add_ordered: vector_reduce_add, vector_reduce_fadd, true, add, -0.0);
arith_red!(simd_reduce_mul_ordered: vector_reduce_mul, vector_reduce_fmul, true, mul, 1.0);
arith_red!(
simd_reduce_add_unordered: vector_reduce_add,
vector_reduce_fadd_reassoc,
false,
add,
0.0
-0.0
);
arith_red!(
simd_reduce_mul_unordered: vector_reduce_mul,