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fix PR3537: if resetting bbi back to the start of a block, we need to 

forget about already inserted expressions.

llvm-svn: 64362
This commit is contained in:
Chris Lattner 2009-02-12 06:56:08 +00:00
parent 1331d53c27
commit 5297c63565
2 changed files with 44 additions and 4 deletions
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13
llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@ -1241,11 +1241,13 @@ bool CodeGenPrepare::OptimizeMemoryInst(Instruction *MemoryInst, Value *Addr,
// computation.
Value *&SunkAddr = SunkAddrs[Addr];
if (SunkAddr) {
DEBUG(cerr << "CGP: Reusing nonlocal addrmode: " << AddrMode << "\n");
DEBUG(cerr << "CGP: Reusing nonlocal addrmode: " << AddrMode << " for "
<< *MemoryInst);
if (SunkAddr->getType() != Addr->getType())
SunkAddr = new BitCastInst(SunkAddr, Addr->getType(), "tmp", InsertPt);
} else {
DEBUG(cerr << "CGP: SINKING nonlocal addrmode: " << AddrMode << "\n");
DEBUG(cerr << "CGP: SINKING nonlocal addrmode: " << AddrMode << " for "
<< *MemoryInst);
const Type *IntPtrTy = TLI->getTargetData()->getIntPtrType();
Value *Result = 0;
@ -1505,9 +1507,12 @@ bool CodeGenPrepare::OptimizeBlock(BasicBlock &BB) {
if (TLI && isa<InlineAsm>(CI->getCalledValue()))
if (const TargetAsmInfo *TAI =
TLI->getTargetMachine().getTargetAsmInfo()) {
if (TAI->ExpandInlineAsm(CI))
if (TAI->ExpandInlineAsm(CI)) {
BBI = BB.begin();
else
// Avoid processing instructions out of order, which could cause
// reuse before a value is defined.
SunkAddrs.clear();
} else
// Sink address computing for memory operands into the block.
MadeChange |= OptimizeInlineAsmInst(I, &(*CI), SunkAddrs);
}

35
llvm/test/CodeGen/X86/2009-02-11-codegenprepare-reuse.ll Normal file
View File

@ -0,0 +1,35 @@
; RUN: llvm-as < %s | llc
; PR3537
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 = "i386-apple-darwin9.6"
%struct.GetBitContext = type <{ i8*, i8*, i32, i32 }>
define i32 @alac_decode_frame() nounwind {
entry:
%tmp2 = load i8** null ; <i8*> [#uses=2]
%tmp34 = getelementptr i8* %tmp2, i32 4 ; <i8*> [#uses=2]
%tmp5.i424 = bitcast i8* %tmp34 to i8** ; <i8**> [#uses=2]
%tmp15.i = getelementptr i8* %tmp2, i32 12 ; <i8*> [#uses=1]
%0 = bitcast i8* %tmp15.i to i32* ; <i32*> [#uses=1]
br i1 false, label %if.then43, label %if.end47
if.then43: ; preds = %entry
ret i32 0
if.end47: ; preds = %entry
%tmp5.i590 = load i8** %tmp5.i424 ; <i8*> [#uses=0]
store i32 19, i32* %0
%tmp6.i569 = load i8** %tmp5.i424 ; <i8*> [#uses=0]
%1 = call i32 asm "bswap $0", "=r,0,~{dirflag},~{fpsr},~{flags}"(i32 0) nounwind ; <i32> [#uses=0]
br i1 false, label %bb.nph, label %if.then63
if.then63: ; preds = %if.end47
unreachable
bb.nph: ; preds = %if.end47
%2 = bitcast i8* %tmp34 to %struct.GetBitContext* ; <%struct.GetBitContext*> [#uses=1]
%call9.i = call fastcc i32 @decode_scalar(%struct.GetBitContext* %2, i32 0, i32 0, i32 0) nounwind ; <i32> [#uses=0]
unreachable
}
declare fastcc i32 @decode_scalar(%struct.GetBitContext* nocapture, i32, i32, i32) nounwind