http://llvm.org/bugs/show_bug.cgi?id=8969
Summary: linux x86-32 stack not kept 16-byte aligned
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=6003)
--> (http://llvm.org/bugs/attachment.cgi?id=6003)
testcase
On 32-bit Linux, the stack is supposed to be 16-byte aligned. LLVM doesn't
actually do that by default.
The attached .bc file demonstrates:
nlewy...@ducttape:~$ llvm/Debug+Asserts/bin/llc -O0 pp.bc -o -
.file "pp.bc"
.text
.hidden prologProcessor
.globl prologProcessor
.align 16, 0x90
.type prologProcessor,@function
prologProcessor: # @prologProcessor
# BB#0:
pushl %ebp
pushl %ebx
pushl %edi
pushl %esi
subl $68, %esp
which is 8-byte aligned, not 16-byte aligned. This isn't ABI compliant.
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