[llvm] r285414 - [InstCombine] move/add tests for smin/smax folds

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Fri Oct 28 11:54:03 2016
New Revision: 285414

URL: http://llvm.org/viewvc/llvm-project?rev=285414&view=rev
Log:
[InstCombine] move/add tests for smin/smax folds

Modified:
    llvm/trunk/test/Transforms/InstCombine/max-of-nots.ll
    llvm/trunk/test/Transforms/InstCombine/select.ll

Modified: llvm/trunk/test/Transforms/InstCombine/max-of-nots.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/max-of-nots.ll?rev=285414&r1=285413&r2=285414&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/max-of-nots.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/max-of-nots.ll Fri Oct 28 11:54:03 2016
@@ -124,3 +124,82 @@ define <2 x i37> @max_of_nots_weird_type
   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
+}
+

Modified: llvm/trunk/test/Transforms/InstCombine/select.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/select.ll?rev=285414&r1=285413&r2=285414&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/select.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/select.ll Fri Oct 28 11:54:03 2016
@@ -1753,31 +1753,6 @@ define i32 @test_select_select1(i32 %a,
   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