mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-22 09:29:31 +00:00
99a92f269d
It is intended to fix PR11468. Old prologue and epilogue looked like this: push %rbp mov %rsp, %rbp and $alignment, %rsp push %r14 push %r15 ... pop %r15 pop %r14 mov %rbp, %rsp pop %rbp The problem was to reference the locations of callee-saved registers in exception handling: locations of callee-saved had to be re-calculated regarding the stack alignment operation. It would take some effort to implement this in LLVM, as currently MachineLocation can only have the form "Register + Offset". Funciton prologue and epilogue are now changed to: push %rbp mov %rsp, %rbp push %14 push %15 and $alignment, %rsp ... lea -$size_of_saved_registers(%rbp), %rsp pop %r15 pop %r14 pop %rbp Reviewed by Chad Rosier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160248 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
874 B
LLVM
34 lines
874 B
LLVM
; RUN: llc < %s -force-align-stack -stack-alignment=32 -march=x86-64 -mattr=+avx -mtriple=i686-apple-darwin10 | FileCheck %s
|
|
; PR11468
|
|
|
|
define void @f(i64 %sz) uwtable {
|
|
entry:
|
|
%a = alloca i32, align 32
|
|
store volatile i32 0, i32* %a, align 32
|
|
; force to push r14 on stack
|
|
call void asm sideeffect "nop", "~{r14},~{dirflag},~{fpsr},~{flags}"() nounwind, !srcloc !0
|
|
ret void
|
|
|
|
; CHECK: _f
|
|
; CHECK: pushq %rbp
|
|
; CHECK: .cfi_offset %rbp, -16
|
|
; CHECK: movq %rsp, %rbp
|
|
; CHECK: .cfi_def_cfa_register %rbp
|
|
|
|
; We first push register on stack, and then realign it, so that
|
|
; .cfi_offset value is correct
|
|
; CHECK: pushq %r14
|
|
; CHECK: andq $-32, %rsp
|
|
; CHECK: .cfi_offset %r14, -24
|
|
|
|
; Restore %rsp from %rbp and subtract the total size of saved regsiters.
|
|
; CHECK: leaq -8(%rbp), %rsp
|
|
|
|
; Pop saved registers.
|
|
; CHECK: popq %r14
|
|
; CHECK: popq %rbp
|
|
}
|
|
|
|
!0 = metadata !{i32 125}
|
|
|