[InstSimplify] add tests for FP with undef operand; NFC

Are any of these correct?

llvm-svn: 326241

Author: rotateright

llvm/test/Transforms/InstSimplify/fdiv.ll

@@ -17,24 +17,6 @@ define float @frem_constant_fold() {
   ret float %f
 }
 
-define double @fdiv_of_undef(double %X) {
-; CHECK-LABEL: @fdiv_of_undef(
-; CHECK-NEXT:    ret double undef
-;
-; undef / X -> undef
-  %r = fdiv double undef, %X
-  ret double %r
-}
-
-define double @fdiv_by_undef(double %X) {
-; CHECK-LABEL: @fdiv_by_undef(
-; CHECK-NEXT:    ret double undef
-;
-; X / undef -> undef
-  %r = fdiv double %X, undef
-  ret double %r
-}
-
 define double @fmul_fdiv_common_operand(double %x, double %y) {
 ; CHECK-LABEL: @fmul_fdiv_common_operand(
 ; CHECK-NEXT:    ret double %x

llvm/test/Transforms/InstSimplify/fp-undef.ll

@@ -0,0 +1,89 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+define float @fadd_undef_op0(float %x) {
+; CHECK-LABEL: @fadd_undef_op0(
+; CHECK-NEXT:    [[R:%.*]] = fadd float undef, [[X:%.*]]
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fadd float undef, %x
+  ret float %r
+}
+
+define float @fadd_undef_op1(float %x) {
+; CHECK-LABEL: @fadd_undef_op1(
+; CHECK-NEXT:    [[R:%.*]] = fadd float [[X:%.*]], undef
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fadd float %x, undef
+  ret float %r
+}
+
+define float @fsub_undef_op0(float %x) {
+; CHECK-LABEL: @fsub_undef_op0(
+; CHECK-NEXT:    [[R:%.*]] = fsub float undef, [[X:%.*]]
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fsub float undef, %x
+  ret float %r
+}
+
+define float @fsub_undef_op1(float %x) {
+; CHECK-LABEL: @fsub_undef_op1(
+; CHECK-NEXT:    [[R:%.*]] = fsub float [[X:%.*]], undef
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fsub float %x, undef
+  ret float %r
+}
+
+define float @fmul_undef_op0(float %x) {
+; CHECK-LABEL: @fmul_undef_op0(
+; CHECK-NEXT:    [[R:%.*]] = fmul float undef, [[X:%.*]]
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fmul float undef, %x
+  ret float %r
+}
+
+define float @fmul_undef_op1(float %x) {
+; CHECK-LABEL: @fmul_undef_op1(
+; CHECK-NEXT:    [[R:%.*]] = fmul float [[X:%.*]], undef
+; CHECK-NEXT:    ret float [[R]]
+;
+  %r = fmul float %x, undef
+  ret float %r
+}
+
+define float @fdiv_undef_op0(float %x) {
+; CHECK-LABEL: @fdiv_undef_op0(
+; CHECK-NEXT:    ret float undef
+;
+  %r = fdiv float undef, %x
+  ret float %r
+}
+
+define float @fdiv_undef_op1(float %x) {
+; CHECK-LABEL: @fdiv_undef_op1(
+; CHECK-NEXT:    ret float undef
+;
+  %r = fdiv float %x, undef
+  ret float %r
+}
+
+define float @frem_undef_op0(float %x) {
+; CHECK-LABEL: @frem_undef_op0(
+; CHECK-NEXT:    ret float undef
+;
+  %r = frem float undef, %x
+  ret float %r
+}
+
+define float @frem_undef_op1(float %x) {
+; CHECK-LABEL: @frem_undef_op1(
+; CHECK-NEXT:    ret float undef
+;
+  %r = frem float %x, undef
+  ret float %r
+}
+