6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-26 23:32:58 +00:00
Code Issues Projects Releases Wiki Activity

ValueTracker can't assume that an alloca with no specified alignment

Browse Source 
will get its preferred alignment.  It has to be careful and cautiously assume
it will just get the ABI alignment.  This prevents instcombine from rounding
up the alignment of a load/store without adjusting the alignment of the alloca.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-01-08 19:28:38 +00:00
parent 1e407c338f
commit 0f2831c820
2 changed files with 27 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/Analysis/ValueTracking.cpp
View File

@ -416,7 +416,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
unsigned Align = AI->getAlignment();
if (Align == 0 && TD) {
if (isa<AllocaInst>(AI))
Align = TD->getPrefTypeAlignment(AI->getType()->getElementType());
Align = TD->getABITypeAlignment(AI->getType()->getElementType());
else if (isa<MallocInst>(AI)) {
// Malloc returns maximally aligned memory.
Align = TD->getABITypeAlignment(AI->getType()->getElementType());

26
test/Transforms/InstCombine/2009-01-08-AlignAlloca.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {, align 4} | count 4
; rdar://6480438
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.Key = type { { i32, i32 } }
%struct.anon = type <{ i8, [3 x i8], i32 }>
define i32 @bar(i64 %key_token2) nounwind {
entry:
%iospec = alloca %struct.Key ; <%struct.Key*> [#uses=3]
%ret = alloca i32 ; <i32*> [#uses=2]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = getelementptr %struct.Key* %iospec, i32 0, i32 0 ; <{ i32, i32 }*> [#uses=2]
%1 = getelementptr { i32, i32 }* %0, i32 0, i32 0 ; <i32*> [#uses=1]
store i32 0, i32* %1, align 4
%2 = getelementptr { i32, i32 }* %0, i32 0, i32 1 ; <i32*> [#uses=1]
store i32 0, i32* %2, align 4
%3 = getelementptr %struct.Key* %iospec, i32 0, i32 0 ; <{ i32, i32 }*> [#uses=1]
%4 = bitcast { i32, i32 }* %3 to i64* ; <i64*> [#uses=1]
store i64 %key_token2, i64* %4, align 4
%5 = call i32 (...)* @foo(%struct.Key* byval align 4 %iospec, i32* %ret) nounwind ; <i32> [#uses=0]
%6 = load i32* %ret, align 4 ; <i32> [#uses=1]
ret i32 %6
}
declare i32 @foo(...)