[InstSimplify] Allow folding of fdiv X, X with just NaNs ignored
Any combination of +-inf/+-inf is NaN so it's already ignored with
nnan and we can skip checking for ninf. Also rephrase logic in comments
a bit.
llvm-svn: 239821
diff --git a/llvm/test/Transforms/InstSimplify/fast-math.ll b/llvm/test/Transforms/InstSimplify/fast-math.ll
index c9ae7ef..90532fa 100644
--- a/llvm/test/Transforms/InstSimplify/fast-math.ll
+++ b/llvm/test/Transforms/InstSimplify/fast-math.ll
@@ -115,79 +115,59 @@
; CHECK: ret double 0
}
-define float @fdiv_self(float %f) {
- %div = fdiv nnan ninf float %f, %f
+define float @fdiv_self(float %f) {
+ %div = fdiv nnan float %f, %f
ret float %div
; CHECK-LABEL: fdiv_self
; CHECK: ret float 1.000000e+00
}
-define float @fdiv_self_invalid1(float %f) {
- %div = fdiv ninf float %f, %f
- ret float %div
-; CHECK-LABEL: fdiv_self_invalid1
-; CHECK: %div = fdiv ninf float %f, %f
-; CHECK-NEXT: ret float %div
-}
-
-define float @fdiv_self_invalid2(float %f) {
- %div = fdiv nnan float %f, %f
- ret float %div
-; CHECK-LABEL: fdiv_self_invalid2
-; CHECK: %div = fdiv nnan float %f, %f
-; CHECK-NEXT: ret float %div
-}
-
-define float @fdiv_self_invalid3(float %f) {
+define float @fdiv_self_invalid(float %f) {
%div = fdiv float %f, %f
ret float %div
-; CHECK-LABEL: fdiv_self_invalid3
+; CHECK-LABEL: fdiv_self_invalid
; CHECK: %div = fdiv float %f, %f
; CHECK-NEXT: ret float %div
}
-define float @fdiv_neg(float %f) {
- %neg = fsub fast float -0.000000e+00, %f
- %div = fdiv nnan ninf float %neg, %f
- ret float %div
-; CHECK-LABEL: fdiv_neg
-; CHECK: ret float -1.000000e+00
-}
-
-define float @fdiv_neg_invalid1(float %f) {
- %neg = fsub fast float -0.000000e+00, %f
- %div = fdiv ninf float %neg, %f
- ret float %div
-; CHECK-LABEL: fdiv_neg_invalid1
-; CHECK: %neg = fsub fast float -0.000000e+00, %f
-; CHECK-NEXT: %div = fdiv ninf float %neg, %f
-; CHECK-NEXT: ret float %div
-}
-
-define float @fdiv_neg_invalid2(float %f) {
+define float @fdiv_neg1(float %f) {
%neg = fsub fast float -0.000000e+00, %f
%div = fdiv nnan float %neg, %f
ret float %div
-; CHECK-LABEL: fdiv_neg_invalid2
-; CHECK: %neg = fsub fast float -0.000000e+00, %f
-; CHECK-NEXT: %div = fdiv nnan float %neg, %f
-; CHECK-NEXT: ret float %div
+; CHECK-LABEL: fdiv_neg1
+; CHECK: ret float -1.000000e+00
}
-define float @fdiv_neg_invalid3(float %f) {
+define float @fdiv_neg2(float %f) {
+ %neg = fsub fast float 0.000000e+00, %f
+ %div = fdiv nnan float %neg, %f
+ ret float %div
+; CHECK-LABEL: fdiv_neg2
+; CHECK: ret float -1.000000e+00
+}
+
+define float @fdiv_neg_invalid(float %f) {
%neg = fsub fast float -0.000000e+00, %f
%div = fdiv float %neg, %f
ret float %div
-; CHECK-LABEL: fdiv_neg_invalid3
+; CHECK-LABEL: fdiv_neg_invalid
; CHECK: %neg = fsub fast float -0.000000e+00, %f
; CHECK-NEXT: %div = fdiv float %neg, %f
; CHECK-NEXT: ret float %div
}
-define float @fdiv_neg_swapped(float %f) {
- %neg = fsub float 0.000000e+00, %f
- %div = fdiv nnan ninf float %f, %neg
+define float @fdiv_neg_swapped1(float %f) {
+ %neg = fsub float -0.000000e+00, %f
+ %div = fdiv nnan float %f, %neg
ret float %div
-; CHECK-LABEL: fdiv_neg_swapped
+; CHECK-LABEL: fdiv_neg_swapped1
+; CHECK: ret float -1.000000e+00
+}
+
+define float @fdiv_neg_swapped2(float %f) {
+ %neg = fsub float 0.000000e+00, %f
+ %div = fdiv nnan float %f, %neg
+ ret float %div
+; CHECK-LABEL: fdiv_neg_swapped2
; CHECK: ret float -1.000000e+00
}