llvm-mirror/test/CodeGen/AArch64/aarch64_win64cc_vararg.ll
Martin Storsjo 22b7cb051b [AArch64] Rewrite stack frame handling for win64 vararg functions
The previous attempt, which made do with a single offset in
computeCalleeSaveRegisterPairs, wasn't quite enough. The previous
attempt only worked as long as CombineSPBump == true (since the
offset would be adjusted later in fixupCalleeSaveRestoreStackOffset).

Instead include the size for the fixed stack area used for win64
varargs in calculations in emitPrologue/emitEpilogue. The stack
consists of mainly three parts;
- AFI->getLocalStackSize()
- AFI->getCalleeSavedStackSize()
- FixedObject

Most of the places in the code which previously used the CSStackSize
now use PrologueSaveSize instead, which is the sum of the latter
two, while some cases which need exactly the middle one use
AFI->getCalleeSavedStackSize() explicitly instead of a local variable.

In addition to moving the offsetting into emitPrologue/emitEpilogue
(which fixes functions with CombineSPBump == false), also set the
frame pointer to point to the right location, where the frame pointer
and link register actually are stored. In addition to the prologue/epilogue,
this also requires changes to resolveFrameIndexReference.

Add tests for a function that keeps a frame pointer and another one
that uses a VLA.

Differential Revision: https://reviews.llvm.org/D35919

llvm-svn: 309744
2017-08-01 21:13:54 +00:00

77 lines
2.1 KiB
LLVM

; RUN: llc < %s -mtriple=aarch64-linux-gnu | FileCheck %s
define win64cc void @pass_va(i32 %count, ...) nounwind {
entry:
; CHECK: str x30, [sp, #-80]!
; CHECK: add x8, sp, #24
; CHECK: add x0, sp, #24
; CHECK: stp x6, x7, [sp, #64]
; CHECK: stp x4, x5, [sp, #48]
; CHECK: stp x2, x3, [sp, #32]
; CHECK: str x1, [sp, #24]
; CHECK: str x8, [sp, #8]
; CHECK: bl other_func
; CHECK: ldr x30, [sp], #80
; CHECK: ret
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
%ap2 = load i8*, i8** %ap, align 8
call void @other_func(i8* %ap2)
ret void
}
declare void @other_func(i8*) local_unnamed_addr
declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_copy(i8*, i8*) nounwind
; CHECK-LABEL: f9:
; CHECK: sub sp, sp, #16
; CHECK: add x8, sp, #24
; CHECK: add x0, sp, #24
; CHECK: str x8, [sp, #8]
; CHECK: add sp, sp, #16
; CHECK: ret
define win64cc i8* @f9(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, i64 %a5, i64 %a6, i64 %a7, i64 %a8, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
%ap2 = load i8*, i8** %ap, align 8
ret i8* %ap2
}
; CHECK-LABEL: f8:
; CHECK: sub sp, sp, #16
; CHECK: add x8, sp, #16
; CHECK: add x0, sp, #16
; CHECK: str x8, [sp, #8]
; CHECK: add sp, sp, #16
; CHECK: ret
define win64cc i8* @f8(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, i64 %a5, i64 %a6, i64 %a7, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
%ap2 = load i8*, i8** %ap, align 8
ret i8* %ap2
}
; CHECK-LABEL: f7:
; CHECK: sub sp, sp, #32
; CHECK: add x8, sp, #24
; CHECK: str x7, [sp, #24]
; CHECK: add x0, sp, #24
; CHECK: str x8, [sp, #8]
; CHECK: add sp, sp, #32
; CHECK: ret
define win64cc i8* @f7(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, i64 %a5, i64 %a6, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
%ap2 = load i8*, i8** %ap, align 8
ret i8* %ap2
}