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SROA: Avoid struct and array types early to avoid creating an overly large integer type. 

Fixes PR14465.

Differential Revision: http://llvm-reviews.chandlerc.com/D148

llvm-svn: 169084
This commit is contained in:
Benjamin Kramer 2012-12-01 11:53:32 +00:00
parent 8e6d64a71d
commit 47534c7440
2 changed files with 16 additions and 0 deletions
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3
llvm/lib/Transforms/Scalar/SROA.cpp
View File

@ -2164,6 +2164,9 @@ static bool isIntegerWideningViable(const DataLayout &TD,
AllocaPartitioning::const_use_iterator I, AllocaPartitioning::const_use_iterator I,
AllocaPartitioning::const_use_iterator E) { AllocaPartitioning::const_use_iterator E) {
uint64_t SizeInBits = TD.getTypeSizeInBits(AllocaTy); uint64_t SizeInBits = TD.getTypeSizeInBits(AllocaTy);
// Don't create integer types larger than the maximum bitwidth.
if (SizeInBits > IntegerType::MAX_INT_BITS)
return false;
// Don't try to handle allocas with bit-padding. // Don't try to handle allocas with bit-padding.
if (SizeInBits != TD.getTypeStoreSizeInBits(AllocaTy)) if (SizeInBits != TD.getTypeStoreSizeInBits(AllocaTy))

13
llvm/test/Transforms/SROA/basictest.ll
View File

@ -1134,3 +1134,16 @@ entry:
ret void ret void
; CHECK: ret ; CHECK: ret
} }
define void @PR14465() {
; Ensure that we don't crash when analyzing a alloca larger than the maximum
; integer type width (MAX_INT_BITS) supported by llvm (1048576*32 > (1<<23)-1).
; CHECK: @PR14465
%stack = alloca [1048576 x i32], align 16
; CHECK: alloca [1048576 x i32]
%cast = bitcast [1048576 x i32]* %stack to i8*
call void @llvm.memset.p0i8.i64(i8* %cast, i8 -2, i64 4194304, i32 16, i1 false)
ret void
; CHECK: ret
}