From bae951d00e70383c801d5e3277783d081efa2ac5 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Fri, 20 Jan 2017 20:14:11 +0000
Subject: [PATCH] [x86] add tests to show missed min/max vector codegen
 (PR31693)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292640 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/vec_minmax_match.ll | 85 ++++++++++++++++++++++++----
 1 file changed, 73 insertions(+), 12 deletions(-)

diff --git a/test/CodeGen/X86/vec_minmax_match.ll b/test/CodeGen/X86/vec_minmax_match.ll
index af4410a898e..6644d5dc84b 100644
--- a/test/CodeGen/X86/vec_minmax_match.ll
+++ b/test/CodeGen/X86/vec_minmax_match.ll
@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx | FileCheck %s
 
@@ -11,7 +12,6 @@ define <4 x i32> @smin_vec1(<4 x i32> %x) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpminsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %not_x = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %cmp = icmp sgt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> %not_x, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
@@ -25,7 +25,6 @@ define <4 x i32> @smin_vec2(<4 x i32> %x) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpminsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %not_x = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %cmp = icmp slt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %not_x
@@ -41,7 +40,6 @@ define <4 x i32> @smin_vec3(<4 x i32> %x, <4 x i32> %y) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm1, %xmm1
 ; CHECK-NEXT:    vpminsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %sub = sub nsw <4 x i32> %x, %y
   %cmp = icmp sgt <4 x i32> %x, %y
   %sel = select <4 x i1> %cmp, <4 x i32> zeroinitializer, <4 x i32> %sub
@@ -57,7 +55,6 @@ define <4 x i32> @smin_vec4(<4 x i32> %x, <4 x i32> %y) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm1, %xmm1
 ; CHECK-NEXT:    vpminsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %sub = sub nsw <4 x i32> %x, %y
   %cmp = icmp slt <4 x i32> %x, %y
   %sel = select <4 x i1> %cmp, <4 x i32> %sub, <4 x i32> zeroinitializer
@@ -71,7 +68,6 @@ define <4 x i32> @smax_vec1(<4 x i32> %x) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %not_x = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %cmp = icmp slt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> %not_x, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
@@ -85,7 +81,6 @@ define <4 x i32> @smax_vec2(<4 x i32> %x) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %not_x = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %cmp = icmp sgt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> %not_x
@@ -101,7 +96,6 @@ define <4 x i32> @smax_vec3(<4 x i32> %x, <4 x i32> %y) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm1, %xmm1
 ; CHECK-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %sub = sub nsw <4 x i32> %x, %y
   %cmp = icmp slt <4 x i32> %x, %y
   %sel = select <4 x i1> %cmp, <4 x i32> zeroinitializer, <4 x i32> %sub
@@ -117,7 +111,6 @@ define <4 x i32> @smax_vec4(<4 x i32> %x, <4 x i32> %y) {
 ; CHECK-NEXT:    vpxor %xmm1, %xmm1, %xmm1
 ; CHECK-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %sub = sub nsw <4 x i32> %x, %y
   %cmp = icmp sgt <4 x i32> %x, %y
   %sel = select <4 x i1> %cmp, <4 x i32> %sub, <4 x i32> zeroinitializer
@@ -129,7 +122,6 @@ define <4 x i32> @umax_vec1(<4 x i32> %x) {
 ; CHECK:       # BB#0:
 ; CHECK-NEXT:    vpmaxud {{.*}}(%rip), %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %cmp = icmp slt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> %x, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
   ret <4 x i32> %sel
@@ -140,7 +132,6 @@ define <4 x i32> @umax_vec2(<4 x i32> %x) {
 ; CHECK:       # BB#0:
 ; CHECK-NEXT:    vpmaxud {{.*}}(%rip), %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %cmp = icmp sgt <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %sel = select <4 x i1> %cmp, <4 x i32> <i32 2147483648, i32 2147483648, i32 2147483648, i32 2147483648>, <4 x i32> %x
   ret <4 x i32> %sel
@@ -151,7 +142,6 @@ define <4 x i32> @umin_vec1(<4 x i32> %x) {
 ; CHECK:       # BB#0:
 ; CHECK-NEXT:    vpminud {{.*}}(%rip), %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %cmp = icmp slt <4 x i32> %x, zeroinitializer
   %sel = select <4 x i1> %cmp, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>, <4 x i32> %x
   ret <4 x i32> %sel
@@ -162,9 +152,80 @@ define <4 x i32> @umin_vec2(<4 x i32> %x) {
 ; CHECK:       # BB#0:
 ; CHECK-NEXT:    vpminud {{.*}}(%rip), %xmm0, %xmm0
 ; CHECK-NEXT:    retq
-;
   %cmp = icmp sgt <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
   %sel = select <4 x i1> %cmp, <4 x i32> %x, <4 x i32> <i32 2147483648, i32 2147483648, i32 2147483648, i32 2147483648>
   ret <4 x i32> %sel
 }
 
+; The next 4 tests are value clamping with constants:
+; https://llvm.org/bugs/show_bug.cgi?id=31693
+
+; (X <s C1) ? C1 : SMIN(X, C2) ==> SMAX(SMIN(X, C2), C1)
+
+define <4 x i32> @clamp_signed1(<4 x i32> %x) {
+; CHECK-LABEL: clamp_signed1:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vpminsd {{.*}}(%rip), %xmm0, %xmm1
+; CHECK-NEXT:    vmovdqa {{.*#+}} xmm2 = [15,15,15,15]
+; CHECK-NEXT:    vpcmpgtd %xmm0, %xmm2, %xmm0
+; CHECK-NEXT:    vblendvps %xmm0, %xmm2, %xmm1, %xmm0
+; CHECK-NEXT:    retq
+  %cmp2 = icmp slt <4 x i32> %x, <i32 255, i32 255, i32 255, i32 255>
+  %min = select <4 x i1> %cmp2, <4 x i32> %x, <4 x i32><i32 255, i32 255, i32 255, i32 255>
+  %cmp1 = icmp slt <4 x i32> %x, <i32 15, i32 15, i32 15, i32 15>
+  %r = select <4 x i1> %cmp1, <4 x i32><i32 15, i32 15, i32 15, i32 15>, <4 x i32> %min
+  ret <4 x i32> %r
+}
+
+; (X >s C1) ? C1 : SMAX(X, C2) ==> SMIN(SMAX(X, C2), C1)
+
+define <4 x i32> @clamp_signed2(<4 x i32> %x) {
+; CHECK-LABEL: clamp_signed2:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vpmaxsd {{.*}}(%rip), %xmm0, %xmm1
+; CHECK-NEXT:    vmovdqa {{.*#+}} xmm2 = [255,255,255,255]
+; CHECK-NEXT:    vpcmpgtd %xmm2, %xmm0, %xmm0
+; CHECK-NEXT:    vblendvps %xmm0, %xmm2, %xmm1, %xmm0
+; CHECK-NEXT:    retq
+  %cmp2 = icmp sgt <4 x i32> %x, <i32 15, i32 15, i32 15, i32 15>
+  %max = select <4 x i1> %cmp2, <4 x i32> %x, <4 x i32><i32 15, i32 15, i32 15, i32 15>
+  %cmp1 = icmp sgt <4 x i32> %x, <i32 255, i32 255, i32 255, i32 255>
+  %r = select <4 x i1> %cmp1, <4 x i32><i32 255, i32 255, i32 255, i32 255>, <4 x i32> %max
+  ret <4 x i32> %r
+}
+
+; (X <u C1) ? C1 : UMIN(X, C2) ==> UMAX(UMIN(X, C2), C1)
+
+define <4 x i32> @clamp_unsigned1(<4 x i32> %x) {
+; CHECK-LABEL: clamp_unsigned1:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vpminud {{.*}}(%rip), %xmm0, %xmm1
+; CHECK-NEXT:    vpxor {{.*}}(%rip), %xmm0, %xmm0
+; CHECK-NEXT:    vmovdqa {{.*#+}} xmm2 = [2147483663,2147483663,2147483663,2147483663]
+; CHECK-NEXT:    vpcmpgtd %xmm0, %xmm2, %xmm0
+; CHECK-NEXT:    vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; CHECK-NEXT:    retq
+  %cmp2 = icmp ult <4 x i32> %x, <i32 255, i32 255, i32 255, i32 255>
+  %min = select <4 x i1> %cmp2, <4 x i32> %x, <4 x i32><i32 255, i32 255, i32 255, i32 255>
+  %cmp1 = icmp ult <4 x i32> %x, <i32 15, i32 15, i32 15, i32 15>
+  %r = select <4 x i1> %cmp1, <4 x i32><i32 15, i32 15, i32 15, i32 15>, <4 x i32> %min
+  ret <4 x i32> %r
+}
+
+; (X >u C1) ? C1 : UMAX(X, C2) ==> UMIN(UMAX(X, C2), C1)
+
+define <4 x i32> @clamp_unsigned2(<4 x i32> %x) {
+; CHECK-LABEL: clamp_unsigned2:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    vpmaxud {{.*}}(%rip), %xmm0, %xmm1
+; CHECK-NEXT:    vpxor {{.*}}(%rip), %xmm0, %xmm0
+; CHECK-NEXT:    vpcmpgtd {{.*}}(%rip), %xmm0, %xmm0
+; CHECK-NEXT:    vblendvps %xmm0, {{.*}}(%rip), %xmm1, %xmm0
+; CHECK-NEXT:    retq
+  %cmp2 = icmp ugt <4 x i32> %x, <i32 15, i32 15, i32 15, i32 15>
+  %max = select <4 x i1> %cmp2, <4 x i32> %x, <4 x i32><i32 15, i32 15, i32 15, i32 15>
+  %cmp1 = icmp ugt <4 x i32> %x, <i32 255, i32 255, i32 255, i32 255>
+  %r = select <4 x i1> %cmp1, <4 x i32><i32 255, i32 255, i32 255, i32 255>, <4 x i32> %max
+  ret <4 x i32> %r
+}
+