llvm-6502/test/CodeGen/X86/aligned-variadic.ll
Duncan P. N. Exon Smith 5012f1db20 X86: Align the stack on word boundaries in LowerFormalArguments()
The goal of the patch is to implement section 3.2.3 of the AMD64 ABI
correctly.  The controlling sentence is, "The size of each argument gets
rounded up to eightbytes.  Therefore the stack will always be eightbyte
aligned." The equivalent sentence in the i386 ABI page 37 says, "At all
times, the stack pointer should point to a word-aligned area."  For both
architectures, the stack pointer is not being rounded up to the nearest
eightbyte or word between the last normal argument and the first
variadic argument.

Patch by Thomas Jablin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216119 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 19:40:59 +00:00

31 lines
1.2 KiB
LLVM

; RUN: llc < %s -march=x86-64 | FileCheck %s -check-prefix=X64
; RUN: llc < %s -march=x86 | FileCheck %s -check-prefix=X32
%struct.Baz = type { [17 x i8] }
%struct.__va_list_tag = type { i32, i32, i8*, i8* }
; Function Attrs: nounwind uwtable
define void @bar(%struct.Baz* byval nocapture readnone align 8 %x, ...) {
entry:
%va = alloca [1 x %struct.__va_list_tag], align 16
%arraydecay = getelementptr inbounds [1 x %struct.__va_list_tag]* %va, i64 0, i64 0
%arraydecay1 = bitcast [1 x %struct.__va_list_tag]* %va to i8*
call void @llvm.va_start(i8* %arraydecay1)
%overflow_arg_area_p = getelementptr inbounds [1 x %struct.__va_list_tag]* %va, i64 0, i64 0, i32 2
%overflow_arg_area = load i8** %overflow_arg_area_p, align 8
%overflow_arg_area.next = getelementptr i8* %overflow_arg_area, i64 24
store i8* %overflow_arg_area.next, i8** %overflow_arg_area_p, align 8
; X32: leal 68(%esp), [[REG:%.*]]
; X32: movl [[REG]], 16(%esp)
; X64: leaq 232(%rsp), [[REG:%.*]]
; X64: movq [[REG]], 184(%rsp)
; X64: leaq 176(%rsp), %rdi
call void @qux(%struct.__va_list_tag* %arraydecay)
ret void
}
; Function Attrs: nounwind
declare void @llvm.va_start(i8*)
declare void @qux(%struct.__va_list_tag*)