goldsteinn wrote:
> Well, I'm not sure how proper that wold be as a reproducer,
>
> I extracted the mentioned test to a program:
>
> ```
> #include <cmath>
>
> #include "third_party/swiftshader/src/Reactor/Coroutine.hpp"
> #include "third_party/swiftshader/src/Reactor/Reactor.hpp"
>
> using float4 = float[4];
> using int4 = int[4];
>
> static std::string testName() { return "test name"; }
>
> using namespace rr;
>
> int main() {
> Function<Void(Pointer<Int4>, Pointer<Int4>)> function;
> {
> Pointer<Int4> x = function.Arg<0>();
> Pointer<Int4> y = function.Arg<1>();
>
> *y = Abs(*x);
> }
>
> auto routine = function(testName().c_str());
> auto callable = (void (*)(int4 *, int4 *))routine->getEntry();
>
> int input[] = {1, -1, 0, (int)0x80000000};
>
> for (int x : input) {
> int4 v_in = {x, x, x, x};
> int4 v_out = {0};
>
> callable(&v_in, &v_out);
>
> float expected = abs(x);
> if (v_out[0] != expected) {
> return 10;
> }
> }
> }
> ```
>
> Before the change program exits with 0, after it exists with 10. More
> precisely: `v_out[0]` is: -2147483648, `expected` is: 2.14748365e+09
>
> [out_at.txt](https://github.com/llvm/llvm-project/files/14670227/out_at.txt)
> [out_before.txt](https://github.com/llvm/llvm-project/files/14670228/out_before.txt)
>
> I attached the generated IR before and after the change. It's only one line
> diff:
>
> ```
> call void @llvm.memset.p0.i64(ptr noundef nonnull align 16
> dereferenceable(16) %9, i8 0, i64 16, i1 false)
> call void %49(ptr noundef nonnull %8, ptr noundef nonnull %9) #16
> %61 = call i32 @llvm.abs.i32(i32 %60, i1 true)
> - %62 = sitofp i32 %61 to float
> + %62 = uitofp i32 %61 to float
> %63 = load i32, ptr %9, align 16
> %64 = sitofp i32 %63 to float
> %65 = fcmp une float %64, %62
> ```
>
> generation command is `clang -O1 -fsized-deallocation '-std=gnu++20' -c
> pre.ii -emit-llvm -S -o /tmp/ir_before.ll`
>
> I'm trying to reduce the preprocessed file, tho not sure i'll keep the
> semantics of the failure.
This should be sufficient, thank you!
https://github.com/llvm/llvm-project/pull/82404
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