[llvm] r302374 - [InstSimplify] add tests for PR32949 miscompile; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Sun May  7 13:19:13 2017
New Revision: 302374

URL: http://llvm.org/viewvc/llvm-project?rev=302374&view=rev
Log:
[InstSimplify] add tests for PR32949 miscompile; NFC

Modified:
    llvm/trunk/test/Transforms/InstSimplify/compare.ll

Modified: llvm/trunk/test/Transforms/InstSimplify/compare.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstSimplify/compare.ll?rev=302374&r1=302373&r2=302374&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstSimplify/compare.ll (original)
+++ llvm/trunk/test/Transforms/InstSimplify/compare.ll Sun May  7 13:19:13 2017
@@ -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) {