dEQP-VK.graphicsfuzz.mix-floor-add about llpc

[amdrexu]

The addend is from a integer bit-cast with the value of <i32 38730, i32 63193, i32 63173>. This value is finally converted to denormals and LLVM applies constant folding for fmuladd, which causes a assert.

[MarcinKantochAMD]

I tested today and the test is passing on LLPC stack. Does it fail or throw an assert? I am testing with a release build.

[MarcinKantochAMD]

Sorry Paul. I was not aware that your issues relate to Debug build. I was testing with a Release build.

[paulthomson]

This still seems to fail.

[jayfoad]

This is a bug in the LLVM floating point emulation code. I've raised it upstream: https://bugs.llvm.org/show_bug.cgi?id=44010

[jayfoad]

There's a fix in upstream review: https://reviews.llvm.org/D69772
Edit: it's been committed: https://reviews.llvm.org/rGe62555c129d535d524354351791c5474c9929582

[jayfoad]

Fixed in GPUOpen-Drivers/llvm-project@e62555c.