[PATCH] D53536: Pointer types were treated as zero-size by MergeICmps
Chang Lin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Oct 26 10:52:26 PDT 2018
clin1 updated this revision to Diff 171320.
clin1 added a comment.
Thanks! I've made the suggested test change.
Repository:
rL LLVM
https://reviews.llvm.org/D53536
Files:
lib/Transforms/Scalar/MergeICmps.cpp
test/Transforms/MergeICmps/X86/int64-and-ptr.ll
Index: test/Transforms/MergeICmps/X86/int64-and-ptr.ll
===================================================================
--- /dev/null
+++ test/Transforms/MergeICmps/X86/int64-and-ptr.ll
@@ -0,0 +1,39 @@
+; RUN: opt < %s -mtriple=x86_64-unknown-unknown -mergeicmps -S | FileCheck %s --check-prefix=X86
+
+; 8-byte int and 8-byte pointer should merge into a 16-byte memcpy.
+; X86: memcmp(i8* {{.*}}, i8* {{.*}}, i64 16)
+
+%struct.outer = type { i64, %struct.inner* }
+%struct.inner = type { i32, i32, i32 }
+
+; Function Attrs: nounwind uwtable
+define dso_local i1 @"?foo@@YAHAEAUouter@@0 at Z"(%struct.outer* align 8 dereferenceable(16) %o1, %struct.outer* align 8 dereferenceable(116) %o2) local_unnamed_addr #0 {
+entry:
+ %p1 = getelementptr inbounds %struct.outer, %struct.outer* %o1, i64 0, i32 0
+ %0 = load i64, i64* %p1, align 8
+ %p11 = getelementptr inbounds %struct.outer, %struct.outer* %o2, i64 0, i32 0
+ %1 = load i64, i64* %p11, align 8
+ %cmp = icmp eq i64 %0, %1
+ br i1 %cmp, label %if.then, label %if.end5
+
+if.then: ; preds = %entry
+ %p2 = getelementptr inbounds %struct.outer, %struct.outer* %o1, i64 0, i32 1
+ %2 = load %struct.inner*, %struct.inner** %p2, align 8
+ %p22 = getelementptr inbounds %struct.outer, %struct.outer* %o2, i64 0, i32 1
+ %3 = load %struct.inner*, %struct.inner** %p22, align 8
+ %cmp3 = icmp eq %struct.inner* %2, %3
+ br label %if.end5
+
+if.end5: ; preds = %if.then, %entry
+ %rez.0 = phi i1 [ %cmp3, %if.then ], [ false, %entry ]
+ ret i1 %rez.0
+}
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
+
+; Function Attrs: argmemonly nounwind
+declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
+
+attributes #0 = { nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { argmemonly nounwind }
+attributes #2 = { nounwind }
Index: lib/Transforms/Scalar/MergeICmps.cpp
===================================================================
--- lib/Transforms/Scalar/MergeICmps.cpp
+++ lib/Transforms/Scalar/MergeICmps.cpp
@@ -283,8 +283,9 @@
if (!Lhs.Base()) return {};
auto Rhs = visitICmpLoadOperand(CmpI->getOperand(1));
if (!Rhs.Base()) return {};
+ const auto &DL = CmpI->getModule()->getDataLayout();
return BCECmpBlock(std::move(Lhs), std::move(Rhs),
- CmpI->getOperand(0)->getType()->getScalarSizeInBits());
+ DL.getTypeSizeInBits(CmpI->getOperand(0)->getType()));
}
return {};
}
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