[X86] Adding a test point for PR34149 'Suboptimal codegen for "fast" minnum and maxnum'

Differential Revision: https://reviews.llvm.org/D37614

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312778 91177308-0d34-0410-b5e6-96231b3b80d8

Author: jbhateja

test/CodeGen/X86/pr34149.ll

@@ -0,0 +1,40 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=haswell | FileCheck %s
+
+declare <4 x double> @llvm.minnum.v4f64(<4 x double> %x, <4 x double> %y)
+declare <4 x double> @llvm.maxnum.v4f64(<4 x double> %x, <4 x double> %y)
+
+define <4 x double> @via_minnum(<4 x double> %x, <4 x double> %y) {
+; CHECK-LABEL: via_minnum:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vminpd %ymm0, %ymm1, %ymm2
+; CHECK-NEXT:    vcmpunordpd %ymm0, %ymm0, %ymm0
+; CHECK-NEXT:    vblendvpd %ymm0, %ymm1, %ymm2, %ymm0
+; CHECK-NEXT:    retq
+  %z = call fast <4 x double> @llvm.minnum.v4f64(<4 x double> %x, <4 x double> %y) readnone
+  ret <4 x double> %z
+}
+
+define <4 x double> @via_maxnum(<4 x double> %x, <4 x double> %y) {
+; CHECK-LABEL: via_maxnum:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vmaxpd %ymm0, %ymm1, %ymm2
+; CHECK-NEXT:    vcmpunordpd %ymm0, %ymm0, %ymm0
+; CHECK-NEXT:    vblendvpd %ymm0, %ymm1, %ymm2, %ymm0
+; CHECK-NEXT:    retq
+  %z = call fast <4 x double> @llvm.maxnum.v4f64(<4 x double> %x, <4 x double> %y) readnone
+  ret <4 x double> %z
+}
+
+define <4 x double> @via_fcmp(<4 x double> %x, <4 x double> %y) {
+; CHECK-LABEL: via_fcmp:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vminpd %ymm0, %ymm1, %ymm0
+; CHECK-NEXT:    retq
+  %c = fcmp ule <4 x double> %x, %y
+  %z = select <4 x i1> %c, <4 x double> %x, <4 x double> %y
+  ret <4 x double> %z
+}
+
+