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Fix a thinko that manifested as a crash on clamav last night.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60251 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-29 20:29:04 +00:00
parent 822293a40c
commit 3a76be584b
2 changed files with 29 additions and 2 deletions
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4
lib/Transforms/Scalar/DeadStoreElimination.cpp
View File

@ -130,7 +130,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
// If we deleted a store, reinvestigate this instruction.
if (deletedStore) {
if (!isa<TerminatorInst>(BB.begin()))
if (BBI != BB.begin())
--BBI;
continue;
}
@ -157,7 +157,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
(!dep.isNormal() || DT.dominates(dep.getInst(), L))) {
DeleteDeadInstruction(S);
if (!isa<TerminatorInst>(BB.begin()))
if (BBI != BB.begin())
--BBI;
NumFastStores++;
MadeChange = true;

27
test/Transforms/DeadStoreElimination/2008-11-29-OffEndOfBlock.ll Normal file
View File

@ -0,0 +1,27 @@
; RUN: llvm-as < %s | opt -dse | llvm-dis
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-darwin7"
%struct.cab_archive = type { i32, i16, i16, i16, i16, i8, %struct.cab_folder*, %struct.cab_file* }
%struct.cab_file = type { i32, i16, i64, i8*, i32, i32, i32, %struct.cab_folder*, %struct.cab_file*, %struct.cab_archive*, %struct.cab_state* }
%struct.cab_folder = type { i16, i16, %struct.cab_archive*, i64, %struct.cab_folder* }
%struct.cab_state = type { i8*, i8*, [38912 x i8], i16, i16, i8*, i16 }
%struct.lzx_stream = type { i32, i32, i8, i64, i64, i8*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i8, i8, i8, i8, i8, i32, i8*, i8*, i8*, i8*, i8*, i32, i32, i32, [84 x i8], [720 x i8], [314 x i8], [72 x i8], [104 x i16], [5408 x i16], [4596 x i16], [144 x i16], [51 x i32], [51 x i8], [32768 x i8], %struct.cab_file*, i32 (%struct.cab_file*, i8*, i32)* }
declare fastcc i32 @lzx_read_lens(%struct.lzx_stream*, i8*, i32, i32) nounwind
define i32 @lzx_decompress(%struct.lzx_stream* %lzx, i64 %out_bytes) nounwind {
bb13: ; preds = %entry
%0 = getelementptr %struct.lzx_stream* %lzx, i32 0, i32 25 ; <i8**> [#uses=2]
%1 = getelementptr %struct.lzx_stream* %lzx, i32 0, i32 26 ; <i8**> [#uses=2]
%2 = getelementptr %struct.lzx_stream* %lzx, i32 0, i32 29 ; <i32*> [#uses=0]
br label %bb14
bb14: ; preds = %bb13
%3 = load i8** %0, align 4 ; <i8*> [#uses=1]
%4 = load i8** %1, align 4 ; <i8*> [#uses=1]
store i8* %3, i8** %0, align 4
store i8* %4, i8** %1, align 4
%5 = call fastcc i32 @lzx_read_lens(%struct.lzx_stream* %lzx, i8* null, i32 256, i32 0) nounwind ; <i32> [#uses=0]
unreachable
}