Teach ComputeMaskedBits about sub nsw.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127548 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
index 75a36b499e..d2c564f567 100644
--- a/test/Transforms/InstSimplify/compare.ll
+++ b/test/Transforms/InstSimplify/compare.ll
@@ -271,6 +271,29 @@ define i1 @srem2(i16 %X, i32 %Y) {
   %D = icmp slt i32 %C, 0
   ret i1 %D
 }
+
+; CHECK: @srem3
+; CHECK-NEXT: ret i1 false
+define i1 @srem3(i16 %X, i32 %Y) {
+  %A = zext i16 %X to i32
+  %B = or i32 2147483648, %A
+  %C = sub nsw i32 1, %B
+  %D = srem i32 %C, %Y
+  %E = icmp slt i32 %D, 0
+  ret i1 %E
+}
+
+; CHECK: @srem4
+; CHECK-NEXT: ret i1 false
+define i1 @srem4(i16 %X, i32 %Y) {
+  %A = zext i16 %X to i32
+  %B = or i32 2147483648, %A
+  %C = sub nsw i32 %A, %B
+  %D = srem i32 %C, %Y
+  %E = icmp slt i32 %D, 0
+  ret i1 %E
+}
+
 define i1 @udiv1(i32 %X) {
 ; CHECK: @udiv1
   %A = udiv i32 %X, 1000000