30836781e8
This fixes the x86 backend to properly reserve `rbp` when the `frame-pointer=reserved` option is used. Currently, this option is ignored. Disassembly of the new test case before: ```s pushq %rbp pushq %rbx pushq %rax movl %esi, %ebx movl %edi, %ebp callq bar@PLT movl %ebp, %edi movl %ebx, %esi callq bar@PLT addq $8, %rsp popq %rbx popq %rbp retq ``` ...and after (`r14` is used as scratch space in place of `rbp`): ```s pushq %r14 pushq %rbx pushq %rax movl %esi, %ebx movl %edi, %r14d callq bar@PLT movl %r14d, %edi movl %ebx, %esi callq bar@PLT addq $8, %rsp popq %rbx popq %r14 retq ``` Fixes #117178.
26 lines
774 B
LLVM
26 lines
774 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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declare void @bar(i32, i32)
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define void @foo(i32 %0, i32 %1) nounwind "frame-pointer"="reserved" {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %r14
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; CHECK-NEXT: pushq %rbx
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: movl %esi, %ebx
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; CHECK-NEXT: movl %edi, %r14d
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; CHECK-NEXT: callq bar@PLT
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; CHECK-NEXT: movl %r14d, %edi
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; CHECK-NEXT: movl %ebx, %esi
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; CHECK-NEXT: callq bar@PLT
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; CHECK-NEXT: addq $8, %rsp
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; CHECK-NEXT: popq %rbx
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; CHECK-NEXT: popq %r14
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; CHECK-NEXT: retq
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call void @bar(i32 %0, i32 %1)
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call void @bar(i32 %0, i32 %1)
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ret void
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}
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