llvm/test/CodeGen/X86/x86-64-ms_abi-vararg.ll
Charles Davis 7e96f0f6ff Make variable argument intrinsics behave correctly in a Win64 CC function.
Summary:
This change makes the variable argument intrinsics, `llvm.va_start` and
`llvm.va_copy`, and the `va_arg` instruction behave as they do on Windows
inside a `CallingConv::X86_64_Win64` function. It's needed for a Clang patch
I have to add support for GCC's `__builtin_ms_va_list` constructs.

Reviewers: nadav, asl, eugenis

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1622

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245990 91177308-0d34-0410-b5e6-96231b3b80d8
2015-08-25 23:27:41 +00:00

109 lines
3.0 KiB
LLVM

; RUN: llc < %s -mcpu=generic -mtriple=x86_64-pc-linux-gnu | FileCheck %s
; Verify that the var arg parameters which are passed in registers are stored
; in home stack slots allocated by the caller and that AP is correctly
; calculated.
define x86_64_win64cc void @average_va(i32 %count, ...) nounwind {
entry:
; CHECK: pushq
; CHECK: movq %r9, 40(%rsp)
; CHECK: movq %r8, 32(%rsp)
; CHECK: movq %rdx, 24(%rsp)
; CHECK: leaq 24(%rsp), %rax
%ap = alloca i8*, align 8 ; <i8**> [#uses=1]
%ap.0 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap.0)
ret void
}
declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_copy(i8*, i8*) nounwind
declare void @llvm.va_end(i8*) nounwind
; CHECK-LABEL: f5:
; CHECK: pushq
; CHECK: leaq 56(%rsp),
define x86_64_win64cc i8** @f5(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap.0)
ret i8** %ap
}
; CHECK-LABEL: f4:
; CHECK: pushq
; CHECK: leaq 48(%rsp),
define x86_64_win64cc i8** @f4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap.0)
ret i8** %ap
}
; CHECK-LABEL: f3:
; CHECK: pushq
; CHECK: leaq 40(%rsp),
define x86_64_win64cc i8** @f3(i64 %a0, i64 %a1, i64 %a2, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap.0)
ret i8** %ap
}
; WinX86_64 uses char* for va_list. Verify that the correct amount of bytes
; are copied using va_copy.
; CHECK-LABEL: copy1:
; CHECK: leaq 32(%rsp), [[REG_copy1:%[a-z]+]]
; CHECK: movq [[REG_copy1]], 8(%rsp)
; CHECK: movq [[REG_copy1]], (%rsp)
; CHECK: ret
define x86_64_win64cc void @copy1(i64 %a0, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%cp = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
%cp.0 = bitcast i8** %cp to i8*
call void @llvm.va_start(i8* %ap.0)
call void @llvm.va_copy(i8* %cp.0, i8* %ap.0)
ret void
}
; CHECK-LABEL: copy4:
; CHECK: leaq 56(%rsp), [[REG_copy4:%[a-z]+]]
; CHECK: movq [[REG_copy4]], 8(%rsp)
; CHECK: movq [[REG_copy4]], (%rsp)
; CHECK: ret
define x86_64_win64cc void @copy4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%cp = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
%cp.0 = bitcast i8** %cp to i8*
call void @llvm.va_start(i8* %ap.0)
call void @llvm.va_copy(i8* %cp.0, i8* %ap.0)
ret void
}
; CHECK-LABEL: arg4:
; va_start:
; CHECK: leaq 48(%rsp), [[REG_arg4_1:%[a-z]+]]
; CHECK: movq [[REG_arg4_1]], (%rsp)
; va_arg:
; CHECK: leaq 52(%rsp), [[REG_arg4_2:%[a-z]+]]
; CHECK: movq [[REG_arg4_2]], (%rsp)
; CHECK: movl 48(%rsp), %eax
; CHECK: ret
define x86_64_win64cc i32 @arg4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap.0 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap.0)
%tmp = va_arg i8** %ap, i32
ret i32 %tmp
}