SLPVectorizer: Make store chain finding more aggressive with GetUnderlyingObject.

This recursively strips all GEPs like the existing code. It also handles bitcasts and
other operations that do not change the pointer value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191847 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/test/Transforms/SLPVectorizer/X86/simplebb.ll b/test/Transforms/SLPVectorizer/X86/simplebb.ll
index cd0b99e646..0b76bec07b 100644
--- a/test/Transforms/SLPVectorizer/X86/simplebb.ll
+++ b/test/Transforms/SLPVectorizer/X86/simplebb.ll
@@ -23,3 +23,24 @@ entry:
   ret void
 }
 
+; Simple 3-pair chain with loads and stores, obfuscated with bitcasts
+; CHECK: test2
+; CHECK: store <2 x double>
+; CHECK: ret
+define void @test2(double* %a, double* %b, i8* %e) {
+entry:
+  %i0 = load double* %a, align 8
+  %i1 = load double* %b, align 8
+  %mul = fmul double %i0, %i1
+  %arrayidx3 = getelementptr inbounds double* %a, i64 1
+  %i3 = load double* %arrayidx3, align 8
+  %arrayidx4 = getelementptr inbounds double* %b, i64 1
+  %i4 = load double* %arrayidx4, align 8
+  %mul5 = fmul double %i3, %i4
+  %c = bitcast i8* %e to double*
+  store double %mul, double* %c, align 8
+  %carrayidx5 = getelementptr inbounds i8* %e, i64 8
+  %arrayidx5 = bitcast i8* %carrayidx5 to double*
+  store double %mul5, double* %arrayidx5, align 8
+  ret void
+}