[InstSimplify] add tests for select+fcmp; NFC

These are translated from InstCombine's test file with the same name.
We should move the transform from InstCombine to InstSimplify.

llvm-svn: 346168

diff --git a/llvm/test/Transforms/InstSimplify/fcmp-select.ll b/llvm/test/Transforms/InstSimplify/fcmp-select.ll
new file mode 100644 (file)
index 0000000..00f49b0
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/fcmp-select.ll
@@ -0,0 +1,102 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+; X == 42.0 ? X : 42.0 --> 42.0
+
+define double @oeq(double %x) {
+; CHECK-LABEL: @oeq(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp oeq double [[X:%.*]], 4.200000e+01
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double [[X]], double 4.200000e+01
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp oeq double %x, 42.0
+  %cond = select i1 %cmp, double %x, double 42.0
+  ret double %cond
+}
+
+; X == 42.0 ? 42.0 : X --> X
+
+define float @oeq_swapped(float %x) {
+; CHECK-LABEL: @oeq_swapped(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp oeq float [[X:%.*]], 4.200000e+01
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], float 4.200000e+01, float [[X]]
+; CHECK-NEXT:    ret float [[COND]]
+;
+  %cmp = fcmp oeq float %x, 42.0
+  %cond = select i1 %cmp, float 42.0, float %x
+  ret float %cond
+}
+
+; x != y ? x : y -> x if it's the right kind of != and at least
+; one of x and y is not negative zero.
+
+; X != 42.0 ? X : 42.0 --> X
+
+define double @une(double %x) {
+; CHECK-LABEL: @une(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], 4.200000e+01
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double [[X]], double 4.200000e+01
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp une double %x, 42.0
+  %cond = select i1 %cmp, double %x, double 42.0
+  ret double %cond
+}
+
+; X != 42.0 ? 42.0 : X --> 42.0
+
+define double @une_swapped(double %x) {
+; CHECK-LABEL: @une_swapped(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], 4.200000e+01
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double 4.200000e+01, double [[X]]
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp une double %x, 42.0
+  %cond = select i1 %cmp, double 42.0, double %x
+  ret double %cond
+}
+
+define double @une_could_be_negzero(double %x, double %y) {
+; CHECK-LABEL: @une_could_be_negzero(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double [[X]], double [[Y]]
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp une double %x, %y
+  %cond = select i1 %cmp, double %x, double %y
+  ret double %cond
+}
+
+define double @une_swapped_could_be_negzero(double %x, double %y) {
+; CHECK-LABEL: @une_swapped_could_be_negzero(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp une double [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double [[Y]], double [[X]]
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp une double %x, %y
+  %cond = select i1 %cmp, double %y, double %x
+  ret double %cond
+}
+
+define double @one(double %x) {
+; CHECK-LABEL: @one(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp one double [[X:%.*]], -1.000000e+00
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double [[X]], double -1.000000e+00
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp one double %x, -1.0
+  %cond = select i1 %cmp, double %x, double -1.0
+  ret double %cond
+}
+
+define double @one_swapped(double %x) {
+; CHECK-LABEL: @one_swapped(
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp one double [[X:%.*]], -1.000000e+00
+; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], double -1.000000e+00, double [[X]]
+; CHECK-NEXT:    ret double [[COND]]
+;
+  %cmp = fcmp one double %x, -1.0
+  %cond = select i1 %cmp, double -1.0, double %x
+  ret double %cond
+}
+