[NFC] Added tests for x/fabs(X) fold

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368200 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/fabs-copysign.ll b/test/Transforms/InstCombine/fabs-copysign.ll
new file mode 100644 (file)
index 0000000..d798b2d
--- /dev/null
+++ b/test/Transforms/InstCombine/fabs-copysign.ll
@@ -0,0 +1,75 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+declare double @llvm.fabs.f64(double)
+declare float @llvm.fabs.f32(float)
+declare void @use(double)
+
+declare double @llvm.copysign.f64(double, double)
+declare float @llvm.copysign.f32(float, float)
+
+define double @fabs_copysign(double %x) {
+; CHECK-LABEL: @fabs_copysign(
+; CHECK-NEXT:    [[TMP1:%.*]] = call nnan ninf double @llvm.copysign.f64(double 1.000000e+00, double [[X:%.*]])
+; CHECK-NEXT:    ret double [[TMP1]]
+;
+  %f = tail call double @llvm.fabs.f64(double %x)
+  %div = fdiv nnan ninf double %x, %f
+  ret double %div
+}
+
+
+define float @fabs_copysignf(float %x) {
+; CHECK-LABEL: @fabs_copysignf(
+; CHECK-NEXT:    [[TMP1:%.*]] = call nnan ninf float @llvm.copysign.f32(float 1.000000e+00, float [[X:%.*]])
+; CHECK-NEXT:    ret float [[TMP1]]
+;
+  %f = tail call float @llvm.fabs.f32(float %x)
+  %div = fdiv nnan ninf float %x, %f
+  ret float %div
+}
+
+define double @fabs_copysign_use(double %x) {
+; CHECK-LABEL: @fabs_copysign_use(
+; CHECK-NEXT:    [[TMP1:%.*]] = call nnan ninf double @llvm.copysign.f64(double 1.000000e+00, double [[X:%.*]])
+; CHECK-NEXT:    ret double [[TMP1]]
+;
+  %f = tail call double @llvm.fabs.f64(double %x)
+  %div = fdiv nnan ninf double %x, %f
+  ret double %div
+}
+
+; Negative tests
+
+define double @fabs_copysign_mismatch(double %x, double %y) {
+; CHECK-LABEL: @fabs_copysign_mismatch(
+; CHECK-NEXT:    [[F:%.*]] = tail call double @llvm.fabs.f64(double [[Y:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv double [[X:%.*]], [[F]]
+; CHECK-NEXT:    ret double [[DIV]]
+;
+  %f = tail call double @llvm.fabs.f64(double %y)
+  %div = fdiv double %x, %f
+  ret double %div
+}
+
+define double @fabs_copysign_no_nnan(double %x) {
+; CHECK-LABEL: @fabs_copysign_no_nnan(
+; CHECK-NEXT:    [[F:%.*]] = tail call double @llvm.fabs.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv ninf double [[X]], [[F]]
+; CHECK-NEXT:    ret double [[DIV]]
+;
+  %f = tail call double @llvm.fabs.f64(double %x)
+  %div = fdiv ninf double %x, %f
+  ret double %div
+}
+
+define double @fabs_copysign_no_ninf(double %x) {
+; CHECK-LABEL: @fabs_copysign_no_ninf(
+; CHECK-NEXT:    [[F:%.*]] = tail call double @llvm.fabs.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv nnan double [[X]], [[F]]
+; CHECK-NEXT:    ret double [[DIV]]
+;
+  %f = tail call double @llvm.fabs.f64(double %x)
+  %div = fdiv nnan double %x, %f
+  ret double %div
+}