mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
5012f1db20
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
31 lines
1.2 KiB
LLVM
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*)
|