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Don't sign extend the char when expanding char -> int during

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load(bitcast(char[4] to i32*)) evaluation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65246 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-02-21 20:50:42 +00:00
parent 92acef0e94
commit 2ec0dbf961
2 changed files with 14 additions and 2 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -11028,12 +11028,12 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI,
APInt SingleChar(numBits, 0);
if (TD->isLittleEndian()) {
for (signed i = len-1; i >= 0; i--) {
SingleChar = (uint64_t) Str[i];
SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
StrVal = (StrVal << 8) | SingleChar;
}
} else {
for (unsigned i = 0; i < len; i++) {
SingleChar = (uint64_t) Str[i];
SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
StrVal = (StrVal << 8) | SingleChar;
}
// Append NULL at the end.

12
test/Transforms/InstCombine/2009-02-21-LoadCST.ll Normal file
View File

@ -0,0 +1,12 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i32 3679669}
; PR3595
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-f80:32:32"
target triple = "i386-pc-linux-gnu"
@.str1 = internal constant [4 x i8] c"\B5%8\00"
define i32 @test() {
%rhsv = load i32* bitcast ([4 x i8]* @.str1 to i32*), align 1
ret i32 %rhsv
}