bd3ee371e9
Linux kernel sets SCTRL_EL1.BT0 and BT1 to 1 unconditionally, which
makes PACIASP equivalent to BTI C + PACIA LR,SP.
Use the shorter instruction sequence by default.
I'm not aware of anyone who needs the opposite. They are welcome to
revert to the current behavior under a subtarget feature or an
environment check.
This reverts commit 571c8c5263.
Differential Revision: https://reviews.llvm.org/D141978
67 lines
1.7 KiB
LLVM
67 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=aarch64-windows | FileCheck %s
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define dso_local i32 @func(ptr %g, i32 %a) {
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entry:
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tail call void %g() #2
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ret i32 %a
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}
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define dso_local i32 @func2(ptr %g, i32 %a) "target-features"="+v8.3a" {
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entry:
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tail call void %g() #2
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ret i32 %a
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 8, !"sign-return-address", i32 1}
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; CHECK-LABEL: func:
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; CHECK-NEXT: .seh_proc func
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; CHECK-NEXT: // %bb.0:
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; CHECK-NEXT: hint #27
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; CHECK-NEXT: .seh_pac_sign_lr
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; CHECK-NEXT: str x19, [sp, #-16]!
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; CHECK-NEXT: .seh_save_reg_x x19, 16
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; CHECK-NEXT: str x30, [sp, #8]
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; CHECK-NEXT: .seh_save_reg x30, 8
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; CHECK-NEXT: .seh_endprologue
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; CHECK: .seh_startepilogue
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; CHECK-NEXT: ldr x30, [sp, #8]
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; CHECK-NEXT: .seh_save_reg x30, 8
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; CHECK-NEXT: ldr x19, [sp], #16
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; CHECK-NEXT: .seh_save_reg_x x19, 16
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; CHECK-NEXT: hint #31
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; CHECK-NEXT: .seh_pac_sign_lr
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; CHECK-NEXT: .seh_endepilogue
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; CHECK-NEXT: ret
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; CHECK-NEXT: .seh_endfunclet
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; CHECK-NEXT: .seh_endproc
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;; For func2, check that the potentially folded autibsp+ret -> retab
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;; is handled correctly - currently we inhibit producing retab here.
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; CHECK-LABEL: func2:
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; CHECK-NEXT: .seh_proc func2
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; CHECK-NEXT: // %bb.0:
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; CHECK-NEXT: pacibsp
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; CHECK-NEXT: .seh_pac_sign_lr
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; CHECK-NEXT: str x19, [sp, #-16]!
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; CHECK-NEXT: .seh_save_reg_x x19, 16
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; CHECK-NEXT: str x30, [sp, #8]
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; CHECK-NEXT: .seh_save_reg x30, 8
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; CHECK-NEXT: .seh_endprologue
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; CHECK: .seh_startepilogue
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; CHECK-NEXT: ldr x30, [sp, #8]
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; CHECK-NEXT: .seh_save_reg x30, 8
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; CHECK-NEXT: ldr x19, [sp], #16
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; CHECK-NEXT: .seh_save_reg_x x19, 16
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; CHECK-NEXT: autibsp
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; CHECK-NEXT: .seh_pac_sign_lr
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; CHECK-NEXT: .seh_endepilogue
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; CHECK-NEXT: ret
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; CHECK-NEXT: .seh_endfunclet
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; CHECK-NEXT: .seh_endproc
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