[llvm] [FPEnv][AMDGPU] Correct AMDGPUSimplifyLibCalls handling of strictfp attribute. (PR #86705)

[Matt Arsenault via llvm-commits]

================
@@ -820,11 +820,11 @@ define float @test_pown_fast_f32_strictfp(float %x, i32 %y) #1 {
 ; CHECK-LABEL: define float @test_pown_fast_f32_strictfp
 ; CHECK-SAME: (float [[X:%.*]], i32 [[Y:%.*]]) #[[ATTR0:[0-9]+]] {
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[__FABS:%.*]] = call fast float @llvm.fabs.f32(float [[X]])
-; CHECK-NEXT:    [[__LOG2:%.*]] = call fast float @llvm.log2.f32(float [[__FABS]])
-; CHECK-NEXT:    [[POWNI2F:%.*]] = sitofp i32 [[Y]] to float
-; CHECK-NEXT:    [[__YLOGX:%.*]] = fmul fast float [[__LOG2]], [[POWNI2F]]
-; CHECK-NEXT:    [[__EXP2:%.*]] = call fast float @llvm.exp2.f32(float [[__YLOGX]])
+; CHECK-NEXT:    [[__FABS:%.*]] = call fast float @llvm.fabs.f32(float [[X]]) #[[ATTR0]]
+; CHECK-NEXT:    [[__LOG2:%.*]] = call fast float @llvm.log2.f32(float [[__FABS]]) #[[ATTR0]]
----------------
arsenm wrote:

this is still emitting an unconstrained log2 

https://github.com/llvm/llvm-project/pull/86705