mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-22 10:29:35 +00:00
Make instcombine ensure that all allocas are explicitly aligned at at
least their preferred alignment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62176 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
1b04694116
commit
6893cd7615
@ -10775,12 +10775,17 @@ Instruction *InstCombiner::visitAllocationInst(AllocationInst &AI) {
|
||||
}
|
||||
}
|
||||
|
||||
// If alloca'ing a zero byte object, replace the alloca with a null pointer.
|
||||
// Note that we only do this for alloca's, because malloc should allocate and
|
||||
// return a unique pointer, even for a zero byte allocation.
|
||||
if (isa<AllocaInst>(AI) && AI.getAllocatedType()->isSized() &&
|
||||
TD->getTypePaddedSize(AI.getAllocatedType()) == 0)
|
||||
return ReplaceInstUsesWith(AI, Constant::getNullValue(AI.getType()));
|
||||
if (isa<AllocaInst>(AI) && AI.getAllocatedType()->isSized()) {
|
||||
// If alloca'ing a zero byte object, replace the alloca with a null pointer.
|
||||
// Note that we only do this for alloca's, because malloc should allocate and
|
||||
// return a unique pointer, even for a zero byte allocation.
|
||||
if (TD->getTypePaddedSize(AI.getAllocatedType()) == 0)
|
||||
return ReplaceInstUsesWith(AI, Constant::getNullValue(AI.getType()));
|
||||
|
||||
// If the alignment is 0 (unspecified), assign it the preferred alignment.
|
||||
if (AI.getAlignment() == 0)
|
||||
AI.setAlignment(TD->getPrefTypeAlignment(AI.getAllocatedType()));
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
@ -1,4 +1,6 @@
|
||||
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {, align 4} | count 4
|
||||
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
|
||||
; RUN: grep {, align 4} %t | count 3
|
||||
; RUN: grep {, align 8} %t | count 3
|
||||
; 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"
|
||||
|
@ -1,4 +1,4 @@
|
||||
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {, align 16} | count 12
|
||||
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {, align 16} | count 14
|
||||
|
||||
@x = external global <2 x i64>, align 16
|
||||
@xx = external global [13 x <2 x i64>], align 16
|
||||
|
Loading…
Reference in New Issue
Block a user