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c68bb48704
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. llvm-svn: 160248
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
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; PR11468
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define void @f(i64 %sz) uwtable {
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entry:
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%a = alloca i32, align 32
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store volatile i32 0, i32* %a, align 32
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; force to push r14 on stack
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call void asm sideeffect "nop", "~{r14},~{dirflag},~{fpsr},~{flags}"() nounwind, !srcloc !0
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ret void
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; CHECK: _f
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; CHECK: pushq %rbp
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; CHECK: .cfi_offset %rbp, -16
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; CHECK: movq %rsp, %rbp
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; CHECK: .cfi_def_cfa_register %rbp
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; We first push register on stack, and then realign it, so that
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; .cfi_offset value is correct
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; CHECK: pushq %r14
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; CHECK: andq $-32, %rsp
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; CHECK: .cfi_offset %r14, -24
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; Restore %rsp from %rbp and subtract the total size of saved regsiters.
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; CHECK: leaq -8(%rbp), %rsp
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; Pop saved registers.
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; CHECK: popq %r14
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; CHECK: popq %rbp
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}
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!0 = metadata !{i32 125}
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