[llvm-branch-commits] [llvm] 54eab29 - [BasicAA] Add test for suboptimal result with unknown sizes (NFC)

[Nikita Popov via llvm-branch-commits]

Author: Nikita Popov
Date: 2020-12-01T18:20:34+01:00
New Revision: 54eab293f523956bdc4b1a98b6cf5abc0bd1ef3f

URL: https://github.com/llvm/llvm-project/commit/54eab293f523956bdc4b1a98b6cf5abc0bd1ef3f
DIFF: https://github.com/llvm/llvm-project/commit/54eab293f523956bdc4b1a98b6cf5abc0bd1ef3f.diff

LOG: [BasicAA] Add test for suboptimal result with unknown sizes (NFC)

Added: 
    

Modified: 
    llvm/test/Analysis/BasicAA/phi-aa.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Analysis/BasicAA/phi-aa.ll b/llvm/test/Analysis/BasicAA/phi-aa.ll
index aa2e078000a7..f5492e6fb00f 100644
--- a/llvm/test/Analysis/BasicAA/phi-aa.ll
+++ b/llvm/test/Analysis/BasicAA/phi-aa.ll
@@ -150,3 +150,26 @@ loop:
   store i32 0, i32* %p2
   br label %loop
 }
+
+; CHECK-LABEL: phi_and_gep_unknown_size
+; CHECK: Just Mod:   call void @llvm.memset.p0i8.i32(i8* %g, i8 0, i32 %size, i1 false) <->   call void @llvm.memset.p0i8.i32(i8* %z, i8 0, i32 %size, i1 false)
+; TODO: This should be NoModRef.
+define void @phi_and_gep_unknown_size(i1 %c, i8* %x, i8* %y, i8* noalias %z, i32 %size) {
+entry:
+  br i1 %c, label %true, label %false
+
+true:
+  br label %exit
+
+false:
+  br label %exit
+
+exit:
+  %p = phi i8* [ %x, %true ], [ %y, %false ]
+  %g = getelementptr inbounds i8, i8* %p, i64 1
+  call void @llvm.memset.p0i8.i32(i8* %g, i8 0, i32 %size, i1 false)
+  call void @llvm.memset.p0i8.i32(i8* %z, i8 0, i32 %size, i1 false)
+  ret void
+}
+
+declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i1)