[InstSimplify] add tests for minnum/maxnum; NFC

This isn't the best fix for PR37776, but it probably
hides the bug with the given code example:
https://bugs.llvm.org/show_bug.cgi?id=37776

We have another test to demonstrate the more general
bug.

llvm-svn: 337126

1 files changed, 82 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
index 04e6ce1bf83..ead4bdbfe5d 100644
--- a/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
+++ b/llvm/test/Transforms/InstSimplify/floating-point-arithmetic.ll
@@ -462,3 +462,85 @@ define float @fabs_select_positive_constants_vector_extract(i32 %c) {
   %fabs = call float @llvm.fabs.f32(float %extract)
   ret float %fabs
 }
+
+declare double @llvm.minnum.f64(double, double)
+declare double @llvm.maxnum.f64(double, double)
+declare <2 x double> @llvm.minnum.v2f64(<2 x double>, <2 x double>)
+declare <2 x double> @llvm.maxnum.v2f64(<2 x double>, <2 x double>)
+
+; From the LangRef for minnum/maxnum:
+; "follows the IEEE-754 semantics for maxNum, which also match for libm’s fmax.
+; If either operand is a NaN, returns the other non-NaN operand."
+
+define double @maxnum_nan_op0(double %x) {
+; CHECK-LABEL: @maxnum_nan_op0(
+; CHECK-NEXT:    [[R:%.*]] = call double @llvm.maxnum.f64(double 0x7FF8000000000000, double [[X:%.*]])
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = call double @llvm.maxnum.f64(double 0x7ff8000000000000, double %x)
+  ret double %r
+}
+
+define double @maxnum_nan_op1(double %x) {
+; CHECK-LABEL: @maxnum_nan_op1(
+; CHECK-NEXT:    [[R:%.*]] = call double @llvm.maxnum.f64(double [[X:%.*]], double 0x7FF800000000DEAD)
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = call double @llvm.maxnum.f64(double %x, double 0x7ff800000000dead)
+  ret double %r
+}
+
+define double @minnum_nan_op0(double %x) {
+; CHECK-LABEL: @minnum_nan_op0(
+; CHECK-NEXT:    [[R:%.*]] = call double @llvm.minnum.f64(double 0x7FF8000DEAD00000, double [[X:%.*]])
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = call double @llvm.minnum.f64(double 0x7ff8000dead00000, double %x)
+  ret double %r
+}
+
+define double @minnum_nan_op1(double %x) {
+; CHECK-LABEL: @minnum_nan_op1(
+; CHECK-NEXT:    [[R:%.*]] = call double @llvm.minnum.f64(double [[X:%.*]], double 0x7FF800DEAD00DEAD)
+; CHECK-NEXT:    ret double [[R]]
+;
+  %r = call double @llvm.minnum.f64(double %x, double 0x7ff800dead00dead)
+  ret double %r
+}
+
+define <2 x double> @maxnum_nan_op0_vec(<2 x double> %x) {
+; CHECK-LABEL: @maxnum_nan_op0_vec(
+; CHECK-NEXT:    [[R:%.*]] = call <2 x double> @llvm.maxnum.v2f64(<2 x double> <double 0x7FF8000000000000, double undef>, <2 x double> [[X:%.*]])
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %r = call <2 x double> @llvm.maxnum.v2f64(<2 x double> <double 0x7ff8000000000000, double undef>, <2 x double> %x)
+  ret <2 x double> %r
+}
+
+define <2 x double> @maxnum_nan_op1_vec(<2 x double> %x) {
+; CHECK-LABEL: @maxnum_nan_op1_vec(
+; CHECK-NEXT:    [[R:%.*]] = call <2 x double> @llvm.maxnum.v2f64(<2 x double> [[X:%.*]], <2 x double> <double 0x7FF800000000DEAD, double 0x7FF8FFFFFFFFFFFF>)
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %r = call <2 x double> @llvm.maxnum.v2f64(<2 x double> %x, <2 x double> <double 0x7ff800000000dead, double 0x7ff8ffffffffffff>)
+  ret <2 x double> %r
+}
+
+define <2 x double> @minnum_nan_op0_vec(<2 x double> %x) {
+; CHECK-LABEL: @minnum_nan_op0_vec(
+; CHECK-NEXT:    [[R:%.*]] = call <2 x double> @llvm.minnum.v2f64(<2 x double> <double undef, double 0x7FF8000DEAD00000>, <2 x double> [[X:%.*]])
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %r = call <2 x double> @llvm.minnum.v2f64(<2 x double> <double undef, double 0x7ff8000dead00000>, <2 x double> %x)
+  ret <2 x double> %r
+}
+
+define <2 x double> @minnum_nan_op1_vec(<2 x double> %x) {
+; CHECK-LABEL: @minnum_nan_op1_vec(
+; CHECK-NEXT:    [[R:%.*]] = call <2 x double> @llvm.minnum.v2f64(<2 x double> [[X:%.*]], <2 x double> <double 0x7FF800DEAD00DEAD, double 0x7FF800DEAD00DEAD>)
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %r = call <2 x double> @llvm.minnum.v2f64(<2 x double> %x, <2 x double> <double 0x7ff800dead00dead, double 0x7ff800dead00dead>)
+  ret <2 x double> %r
+}
+