[llvm] r366662 - [InstCombine] Add foldAndOfICmps test cases inspired by PR42691.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Sun Jul 21 19:43:43 2019
New Revision: 366662

URL: http://llvm.org/viewvc/llvm-project?rev=366662&view=rev
Log:
[InstCombine] Add foldAndOfICmps test cases inspired by PR42691.

icmp ne %x, INT_MIN can be treated similarly to icmp sgt %x, INT_MIN.
icmp ne %x, INT_MAX can be treated similarly to icmp slt %x, INT_MAX.
icmp ne %x, UINT_MAX can be treated similarly to icmp ult %x, UINT_MAX.

We already treat icmp ne %x, 0 similarly to icmp ugt %x, 0

Modified:
    llvm/trunk/test/Transforms/InstCombine/and-or-icmps.ll

Modified: llvm/trunk/test/Transforms/InstCombine/and-or-icmps.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/and-or-icmps.ll?rev=366662&r1=366661&r2=366662&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/and-or-icmps.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/and-or-icmps.ll Sun Jul 21 19:43:43 2019
@@ -338,3 +338,42 @@ define i1 @PR42691_7(i32 %x) {
   %c = or i1 %c1, %c2
   ret i1 %c
 }
+
+define i1 @PR42691_8(i32 %x) {
+; CHECK-LABEL: @PR42691_8(
+; CHECK-NEXT:    [[C1:%.*]] = icmp slt i32 %x, 14
+; CHECK-NEXT:    [[C2:%.*]] = icmp ne i32 %x, -2147483648
+; CHECK-NEXT:    [[C:%.*]] = and i1 [[C1]], [[C2]]
+; CHECK-NEXT:    ret i1 [[C]]
+;
+  %c1 = icmp slt i32 %x, 14
+  %c2 = icmp ne i32 %x, -2147483648
+  %c = and i1 %c1, %c2
+  ret i1 %c
+}
+
+define i1 @PR42691_9(i32 %x) {
+; CHECK-LABEL: @PR42691_9(
+; CHECK-NEXT:    [[C1:%.*]] = icmp sgt i32 %x, 13
+; CHECK-NEXT:    [[C2:%.*]] = icmp ne i32 %x, 2147483647
+; CHECK-NEXT:    [[C:%.*]] = and i1 [[C1]], [[C2]]
+; CHECK-NEXT:    ret i1 [[C]]
+;
+  %c1 = icmp sgt i32 %x, 13
+  %c2 = icmp ne i32 %x, 2147483647
+  %c = and i1 %c1, %c2
+  ret i1 %c
+}
+
+define i1 @PR42691_10(i32 %x) {
+; CHECK-LABEL: @PR42691_10(
+; CHECK-NEXT:    [[C1:%.*]] = icmp ugt i32 %x, 13
+; CHECK-NEXT:    [[C2:%.*]] = icmp ne i32 %x, -1
+; CHECK-NEXT:    [[C:%.*]] = and i1 [[C1]], [[C2]]
+; CHECK-NEXT:    ret i1 [[C]]
+;
+  %c1 = icmp ugt i32 %x, 13
+  %c2 = icmp ne i32 %x, 4294967295
+  %c = and i1 %c1, %c2
+  ret i1 %c
+}