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Disable the main feature of 130180, the elimination of loads that are

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redundant with partially-aliasing loads.

When computing what portion of a clobbering load value is needed,
it doesn't consider phi-translation which may have occurred
between the clobbing load and the redundant load.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132631 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2011-06-04 06:48:50 +00:00
parent baddf6c8b0
commit a3351a0e5d
2 changed files with 18 additions and 12 deletions
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6
lib/Analysis/MemoryDependenceAnalysis.cpp
View File

@ -374,10 +374,16 @@ getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad,
if (R == AliasAnalysis::MustAlias)
return MemDepResult::getDef(Inst);
#if 0 // FIXME: Temporarily disabled. GVN is cleverly rewriting loads
// in terms of clobbering loads, but since it does this by looking
// at the clobbering load directly, it doesn't know about any
// phi translation that may have happened along the way.
// If we have a partial alias, then return this as a clobber for the
// client to handle.
if (R == AliasAnalysis::PartialAlias)
return MemDepResult::getClobber(Inst);
#endif
// Random may-alias loads don't depend on each other without a
// dependence.

24
test/Transforms/GVN/rle.ll
View File

@ -562,14 +562,14 @@ entry:
%add = add nsw i32 %tmp2, %conv
ret i32 %add
; CHECK: @load_load_partial_alias
; CHECK: load i32*
; CHECK-NOT: load
; CHECK: lshr i32 {{.*}}, 8
; CHECK-NOT: load
; CHECK: trunc i32 {{.*}} to i8
; CHECK-NOT: load
; CHECK: ret i32
; TEMPORARILYDISABLED: @load_load_partial_alias
; TEMPORARILYDISABLED: load i32*
; TEMPORARILYDISABLED-NOT: load
; TEMPORARILYDISABLED: lshr i32 {{.*}}, 8
; TEMPORARILYDISABLED-NOT: load
; TEMPORARILYDISABLED: trunc i32 {{.*}} to i8
; TEMPORARILYDISABLED-NOT: load
; TEMPORARILYDISABLED: ret i32
}
@ -589,10 +589,10 @@ land.lhs.true: ; preds = %entry
if.end:
ret i32 52
; CHECK: @load_load_partial_alias_cross_block
; CHECK: land.lhs.true:
; CHECK-NOT: load i8
; CHECK: ret i32 %conv6
; TEMPORARILY_DISABLED: @load_load_partial_alias_cross_block
; TEMPORARILY_DISABLED: land.lhs.true:
; TEMPORARILY_DISABLED-NOT: load i8
; TEMPORARILY_DISABLED: ret i32 %conv6
}