dff114b356
With -fomit-frame-pointer, even if we set up a frame pointer for other reasons (e.g. variable-sized or over-aligned stack allocations), we don't need to create an ABI-compliant frame record. This means that we can save all of the general-purpose registers in one push, instead of splitting it to ensure that the frame pointer and link register are adjacent on the stack, saving two instructions per function.
46 lines
1.6 KiB
LLVM
46 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc --force-dwarf-frame-section %s -o - | FileCheck %s
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; RUN: llc --filetype=obj %s -o - | llvm-readelf -u - | FileCheck %s --check-prefix=UNWIND
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv8.1m.main-arm-unknown-eabi"
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; Check the function starts with `pacbti` and correct unwind info is emitted
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define hidden i32 @_Z1fi(i32 %x) "sign-return-address"="non-leaf" "sign-return-address-key"="a_key" "branch-target-enforcement" {
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; CHECK-LABEL: _Z1fi:
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; CHECK: .cfi_sections .debug_frame
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: @ %bb.0: @ %entry
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; CHECK-NEXT: pacbti r12, lr, sp
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; CHECK-NEXT: .save {r7, ra_auth_code, lr}
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; CHECK-NEXT: push.w {r7, r12, lr}
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; CHECK-NEXT: .cfi_def_cfa_offset 12
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; CHECK-NEXT: .cfi_offset lr, -4
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; CHECK-NEXT: .cfi_offset ra_auth_code, -8
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; CHECK-NEXT: .cfi_offset r7, -12
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; CHECK-NEXT: .pad #4
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; CHECK-NEXT: sub sp, #4
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: adds r0, #1
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; CHECK-NEXT: bl _Z1gi
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; CHECK-NEXT: subs r0, #1
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; CHECK-NEXT: add sp, #4
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; CHECK-NEXT: pop.w {r7, r12, lr}
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; CHECK-NEXT: aut r12, lr, sp
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; CHECK-NEXT: bx lr
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entry:
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%add = add nsw i32 %x, 1
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%call = tail call i32 @_Z1gi(i32 %add)
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%sub = add nsw i32 %call, -1
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ret i32 %sub
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}
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declare dso_local i32 @_Z1gi(i32)
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; UNWIND-LABEL: Opcodes [
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; UNWIND-NEXT: 0x00 ; vsp = vsp + 4
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; UNWIND-NEXT: 0x80 0x08 ; pop {r7}
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; UNWIND-NEXT: 0xB4 ; pop ra_auth_code
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; UNWIND-NEXT: 0x84 0x00 ; pop {lr}
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