[llvm] [HLSL] Move FNeg legalization to the DXILLegalization pass (PR #140942)

[Joshua Batista via llvm-commits]

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@@ -0,0 +1,23 @@
+; RUN: opt -S -passes='dxil-legalize' -mtriple=dxil-pc-shadermodel6.3-library %s | FileCheck %s
+
+define float @negateF(float %x) {
+; CHECK-LABEL: define float @negateF(
+; CHECK-SAME: float [[X:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[Y:%.*]] = fsub float -0.000000e+00, [[X]]
+; CHECK-NEXT:    ret float [[Y]]
+entry:  
+  %y = fneg float %x
+  ret float %y
+}
+
+define double @negateD(double %x) {
+; CHECK-LABEL: define double @negateD(
+; CHECK-SAME: double [[X:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[Y:%.*]] = fsub double -0.000000e+00, [[X]]
+; CHECK-NEXT:    ret double [[Y]]
+entry:  
+  %y = fneg double %x
+  ret double %y
+}
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bob80905 wrote:

nit: add a new line at end of file

https://github.com/llvm/llvm-project/pull/140942