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Fix an issue where GVN had the sizes of the two memcpy's reverse, resulting

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in an invalid transformation.

llvm-svn: 47639
This commit is contained in:
Owen Anderson 2008-02-26 23:06:17 +00:00
parent 98774b4b6a
commit eadd074b22
2 changed files with 47 additions and 2 deletions
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4
lib/Transforms/Scalar/GVN.cpp
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@ -1188,8 +1188,8 @@ bool GVN::processMemCpy(MemCpyInst* M, MemCpyInst* MDep,
if (!C1 || !C2)
return false;
uint64_t CpySize = C1->getValue().getZExtValue();
uint64_t DepSize = C2->getValue().getZExtValue();
uint64_t DepSize = C1->getValue().getZExtValue();
uint64_t CpySize = C2->getValue().getZExtValue();
if (DepSize < CpySize)
return false;

45
test/Transforms/GVN/2008-02-26-MemCpySize.ll Normal file
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@ -0,0 +1,45 @@
; RUN: llvm-as < %s | opt -gvn -dse | llvm-dis | grep {call.*memcpy.*cell} | count 2
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin9"
%struct.s = type { [11 x i8], i32 }
@.str = internal constant [11 x i8] c"0123456789\00" ; <[11 x i8]*> [#uses=1]
@cell = weak global %struct.s zeroinitializer ; <%struct.s*> [#uses=2]
declare i32 @check(%struct.s* byval %p) nounwind
declare i32 @strcmp(i8*, i8*) nounwind readonly
define i32 @main() noreturn nounwind {
entry:
%p = alloca %struct.s, align 8 ; <%struct.s*> [#uses=2]
store i32 99, i32* getelementptr (%struct.s* @cell, i32 0, i32 1), align 4
call void @llvm.memcpy.i32( i8* getelementptr (%struct.s* @cell, i32 0, i32 0, i32 0), i8* getelementptr ([11 x i8]* @.str, i32 0, i32 0), i32 11, i32 1 )
%tmp = getelementptr %struct.s* %p, i32 0, i32 0, i32 0 ; <i8*> [#uses=2]
call void @llvm.memcpy.i64( i8* %tmp, i8* getelementptr (%struct.s* @cell, i32 0, i32 0, i32 0), i64 16, i32 8 )
%tmp1.i = getelementptr %struct.s* %p, i32 0, i32 1 ; <i32*> [#uses=1]
%tmp2.i = load i32* %tmp1.i, align 4 ; <i32> [#uses=1]
%tmp3.i = icmp eq i32 %tmp2.i, 99 ; <i1> [#uses=1]
br i1 %tmp3.i, label %bb5.i, label %bb
bb5.i: ; preds = %entry
%tmp91.i = call i32 @strcmp( i8* %tmp, i8* getelementptr ([11 x i8]* @.str, i32 0, i32 0) ) nounwind readonly ; <i32> [#uses=1]
%tmp53 = icmp eq i32 %tmp91.i, 0 ; <i1> [#uses=1]
br i1 %tmp53, label %bb7, label %bb
bb: ; preds = %bb5.i, %entry
call void @abort( ) noreturn nounwind
unreachable
bb7: ; preds = %bb5.i
call void @exit( i32 0 ) noreturn nounwind
unreachable
}
declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind
declare void @abort() noreturn nounwind
declare void @exit(i32) noreturn nounwind
declare void @llvm.memcpy.i64(i8*, i8*, i64, i32) nounwind