From 19ace1d548c0f9663eaec5c16e6b04a576610e86 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Fri, 28 Oct 2016 16:54:03 +0000
Subject: [PATCH] [InstCombine] move/add tests for smin/smax folds

llvm-svn: 285414
---
 llvm/test/Transforms/InstCombine/max-of-nots.ll | 79 +++++++++++++++++++++++++
 llvm/test/Transforms/InstCombine/select.ll      | 25 --------
 2 files changed, 79 insertions(+), 25 deletions(-)

diff --git a/llvm/test/Transforms/InstCombine/max-of-nots.ll b/llvm/test/Transforms/InstCombine/max-of-nots.ll
index d9a13e5..4ef0b83 100644
--- a/llvm/test/Transforms/InstCombine/max-of-nots.ll
+++ b/llvm/test/Transforms/InstCombine/max-of-nots.ll
@@ -124,3 +124,82 @@ define <2 x i37> @max_of_nots_weird_type_vec(<2 x i37> %x, <2 x i37> %y) {
   ret <2 x i37> %smax96
 }
 
+; max(min(%a, -1), -1) == -1
+define i32 @max_of_min(i32 %a) {
+; CHECK-LABEL: @max_of_min(
+; CHECK-NEXT:    ret i32 -1
+;
+  %not_a = xor i32 %a, -1
+  %c0 = icmp sgt i32 %a, 0
+  %s0 = select i1 %c0, i32 %not_a, i32 -1
+  %c1 = icmp sgt i32 %s0, -1
+  %s1 = select i1 %c1, i32 %s0, i32 -1
+  ret i32 %s1
+}
+
+; max(min(%a, -1), -1) == -1 (swap predicate and select ops)
+define i32 @max_of_min_swap(i32 %a) {
+; CHECK-LABEL: @max_of_min_swap(
+; CHECK-NEXT:    [[NOT_A:%.*]] = xor i32 %a, -1
+; CHECK-NEXT:    [[C0:%.*]] = icmp slt i32 %a, 0
+; CHECK-NEXT:    [[S0:%.*]] = select i1 [[C0]], i32 -1, i32 [[NOT_A]]
+; CHECK-NEXT:    [[C1:%.*]] = icmp sgt i32 [[S0]], -1
+; CHECK-NEXT:    [[S1:%.*]] = select i1 [[C1]], i32 [[S0]], i32 -1
+; CHECK-NEXT:    ret i32 [[S1]]
+;
+  %not_a = xor i32 %a, -1
+  %c0 = icmp slt i32 %a, 0
+  %s0 = select i1 %c0, i32 -1, i32 %not_a
+  %c1 = icmp sgt i32 %s0, -1
+  %s1 = select i1 %c1, i32 %s0, i32 -1
+  ret i32 %s1
+}
+
+; min(max(%a, -1), -1) == -1
+define i32 @min_of_max(i32 %a) {
+; CHECK-LABEL: @min_of_max(
+; CHECK-NEXT:    [[NOT_A:%.*]] = xor i32 %a, -1
+; CHECK-NEXT:    [[C0:%.*]] = icmp slt i32 %a, 0
+; CHECK-NEXT:    [[S0:%.*]] = select i1 [[C0]], i32 [[NOT_A]], i32 -1
+; CHECK-NEXT:    [[C1:%.*]] = icmp slt i32 [[S0]], -1
+; CHECK-NEXT:    [[S1:%.*]] = select i1 [[C1]], i32 [[S0]], i32 -1
+; CHECK-NEXT:    ret i32 [[S1]]
+;
+  %not_a = xor i32 %a, -1
+  %c0 = icmp slt i32 %a, 0
+  %s0 = select i1 %c0, i32 %not_a, i32 -1
+  %c1 = icmp slt i32 %s0, -1
+  %s1 = select i1 %c1, i32 %s0, i32 -1
+  ret i32 %s1
+}
+
+; min(max(%a, -1), -1) == -1 (swap predicate and select ops)
+define i32 @min_of_max_swap(i32 %a) {
+; CHECK-LABEL: @min_of_max_swap(
+; CHECK-NEXT:    [[NOT_A:%.*]] = xor i32 %a, -1
+; CHECK-NEXT:    [[C0:%.*]] = icmp sgt i32 %a, 0
+; CHECK-NEXT:    [[S0:%.*]] = select i1 [[C0]], i32 -1, i32 [[NOT_A]]
+; CHECK-NEXT:    [[C1:%.*]] = icmp slt i32 [[S0]], -1
+; CHECK-NEXT:    [[S1:%.*]] = select i1 [[C1]], i32 [[S0]], i32 -1
+; CHECK-NEXT:    ret i32 [[S1]]
+;
+  %not_a = xor i32 %a, -1
+  %c0 = icmp sgt i32 %a, 0
+  %s0 = select i1 %c0, i32 -1, i32 %not_a
+  %c1 = icmp slt i32 %s0, -1
+  %s1 = select i1 %c1, i32 %s0, i32 -1
+  ret i32 %s1
+}
+
+define <2 x i32> @max_of_min_vec(<2 x i32> %a) {
+; CHECK-LABEL: @max_of_min_vec(
+; CHECK-NEXT:    ret <2 x i32> <i32 -1, i32 -1>
+;
+  %not_a = xor <2 x i32> %a, <i32 -1, i32 -1>
+  %c0 = icmp sgt <2 x i32> %a, zeroinitializer
+  %s0 = select <2 x i1> %c0, <2 x i32> %not_a, <2 x i32> <i32 -1, i32 -1>
+  %c1 = icmp sgt <2 x i32> %s0, <i32 -1, i32 -1>
+  %s1 = select <2 x i1> %c1, <2 x i32> %s0, <2 x i32> <i32 -1, i32 -1>
+  ret <2 x i32> %s1
+}
+
diff --git a/llvm/test/Transforms/InstCombine/select.ll b/llvm/test/Transforms/InstCombine/select.ll
index 69b7b57..5838ae8 100644
--- a/llvm/test/Transforms/InstCombine/select.ll
+++ b/llvm/test/Transforms/InstCombine/select.ll
@@ -1753,31 +1753,6 @@ define i32 @test_select_select1(i32 %a, i32 %r0, i32 %r1, i32 %v1, i32 %v2) {
   ret i32 %s1
 }
 
-; MAX(MIN(%a, -1), -1) == -1
-define i32 @test_max_of_min(i32 %a) {
-; CHECK-LABEL: @test_max_of_min(
-; CHECK-NEXT:    ret i32 -1
-;
-  %not_a = xor i32 %a, -1
-  %c0 = icmp sgt i32 %a, 0
-  %s0 = select i1 %c0, i32 %not_a, i32 -1
-  %c1 = icmp sgt i32 %s0, -1
-  %s1 = select i1 %c1, i32 %s0, i32 -1
-  ret i32 %s1
-}
-
-define <2 x i32> @test_max_of_min_vec(<2 x i32> %a) {
-; CHECK-LABEL: @test_max_of_min_vec(
-; CHECK-NEXT:    ret <2 x i32> <i32 -1, i32 -1>
-;
-  %not_a = xor <2 x i32> %a, <i32 -1, i32 -1>
-  %c0 = icmp sgt <2 x i32> %a, zeroinitializer
-  %s0 = select <2 x i1> %c0, <2 x i32> %not_a, <2 x i32> <i32 -1, i32 -1>
-  %c1 = icmp sgt <2 x i32> %s0, <i32 -1, i32 -1>
-  %s1 = select <2 x i1> %c1, <2 x i32> %s0, <2 x i32> <i32 -1, i32 -1>
-  ret <2 x i32> %s1
-}
-
 define i32 @PR23757(i32 %x) {
 ; CHECK-LABEL: @PR23757
 ; CHECK:      %[[cmp:.*]] = icmp eq i32 %x, 2147483647
-- 
2.7.4