[llvm] AMDGPU: Make v2f64 -> v2f16 conversion Legal only when unsafe fast math is set (PR #134738)

[Changpeng Fang via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=amdgcn -mcpu=gfx950 -global-isel=0 < %s | FileCheck -check-prefixes=GFX950,GFX950-SAFE-SDAG %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx950 -global-isel=1 < %s | FileCheck -check-prefixes=GFX950,GFX950-SAFE-GISEL %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx950 -global-isel=0 -enable-unsafe-fp-math < %s | FileCheck -check-prefixes=GFX950,GFX950-UNSAFE %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx950 -global-isel=1 -enable-unsafe-fp-math < %s | FileCheck -check-prefixes=GFX950,GFX950-UNSAFE %s
+
+define amdgpu_ps <2 x half> @v_test_cvt_v2f32_v2f16(<2 x float> %src) {
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changpeng wrote:

> Don't need the shader conventions. Also test the scalar case and wider vector s

Removed the shade conventions, and added tests for other types.


https://github.com/llvm/llvm-project/pull/134738