[InstSimplify] add tests for PR32949 miscompile; NFC

llvm-svn: 302374

1 files changed, 27 insertions, 2 deletions

diff --git a/llvm/test/Transforms/InstSimplify/compare.ll b/llvm/test/Transforms/InstSimplify/compare.ll
index cd2fa880294..883bf31ff77 100644
--- a/llvm/test/Transforms/InstSimplify/compare.ll
+++ b/llvm/test/Transforms/InstSimplify/compare.ll
@@ -576,13 +576,38 @@ define i1 @srem3(i16 %X, i32 %Y) {
   ret i1 %E
 }
 
-define i1 @udiv2(i32 %X, i32 %Y, i32 %Z) {
+define i1 @udiv2(i32 %Z) {
 ; CHECK-LABEL: @udiv2(
+; CHECK-NEXT:    ret i1 true
+;
   %A = udiv exact i32 10, %Z
   %B = udiv exact i32 20, %Z
   %C = icmp ult i32 %A, %B
   ret i1 %C
-; CHECK: ret i1 true
+}
+
+; Exact sdiv and equality preds can simplify.
+
+define i1 @sdiv_exact_equality(i32 %Z) {
+; CHECK-LABEL: @sdiv_exact_equality(
+; CHECK-NEXT:    ret i1 false
+;
+  %A = sdiv exact i32 10, %Z
+  %B = sdiv exact i32 20, %Z
+  %C = icmp eq i32 %A, %B
+  ret i1 %C
+}
+
+; FIXME: But not other preds: PR32949 - https://bugs.llvm.org/show_bug.cgi?id=32949
+
+define i1 @sdiv_exact_not_equality(i32 %Z) {
+; CHECK-LABEL: @sdiv_exact_not_equality(
+; CHECK-NEXT:    ret i1 true
+;
+  %A = sdiv exact i32 10, %Z
+  %B = sdiv exact i32 20, %Z
+  %C = icmp ult i32 %A, %B
+  ret i1 %C
 }
 
 define i1 @udiv3(i32 %X, i32 %Y) {