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1c035c4cf5
When the SP in not changed because of realignment/VLAs etc., we restore the SP by using the previous value of SP and not the FP. Breaking the dependency will help in cases when the epilog of a callee is close to the epilog of the caller; for then "sub sp, fp, #" depends on the load restoring the FP in the epilog of the callee. http://reviews.llvm.org/D18060 Patch by Aditya Kumar and Evandro Menezes. llvm-svn: 263458
237 lines
6.1 KiB
LLVM
237 lines
6.1 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim -tailcallopt | FileCheck %s -check-prefix CHECK-TAIL
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; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim | FileCheck %s
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; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim -tailcallopt -aarch64-redzone | FileCheck %s -check-prefix CHECK-TAIL-RZ
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; Without tailcallopt fastcc still means the caller cleans up the
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; stack, so try to make sure this is respected.
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define fastcc void @func_stack0() {
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; CHECK-LABEL: func_stack0:
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; CHECK: mov x29, sp
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; CHECK: str w{{[0-9]+}}, [sp, #-32]!
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; CHECK-TAIL-LABEL: func_stack0:
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; CHECK-TAIL: stp x29, x30, [sp, #-16]!
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; CHECK-TAIL-NEXT: mov x29, sp
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; CHECK-TAIL: str w{{[0-9]+}}, [sp, #-32]!
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call fastcc void @func_stack8([8 x i32] undef, i32 42)
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; CHECK: bl func_stack8
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack8
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; CHECK-TAIL: sub sp, sp, #16
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call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
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; CHECK: bl func_stack32
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack32
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; CHECK-TAIL: sub sp, sp, #32
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call fastcc void @func_stack0()
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; CHECK: bl func_stack0
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; CHECK-NOT: sub sp, sp
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; CHECK-TAIL: bl func_stack0
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; CHECK-TAIL-NOT: sub sp, sp
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ret void
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; CHECK: add sp, sp, #32
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; CHECK-NEXT: ldp x29, x30, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-TAIL: add sp, sp, #32
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; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
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; CHECK-TAIL-NEXT: ret
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}
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define fastcc void @func_stack8([8 x i32], i32 %stacked) {
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; CHECK-LABEL: func_stack8:
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; CHECK: stp x29, x30, [sp, #-16]!
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; CHECK: mov x29, sp
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; CHECK: str w{{[0-9]+}}, [sp, #-32]!
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; CHECK-TAIL-LABEL: func_stack8:
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; CHECK-TAIL: stp x29, x30, [sp, #-16]!
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; CHECK-TAIL: mov x29, sp
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; CHECK-TAIL: str w{{[0-9]+}}, [sp, #-32]!
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call fastcc void @func_stack8([8 x i32] undef, i32 42)
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; CHECK: bl func_stack8
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack8
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; CHECK-TAIL: sub sp, sp, #16
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call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
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; CHECK: bl func_stack32
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack32
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; CHECK-TAIL: sub sp, sp, #32
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call fastcc void @func_stack0()
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; CHECK: bl func_stack0
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; CHECK-NOT: sub sp, sp
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; CHECK-TAIL: bl func_stack0
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; CHECK-TAIL-NOT: sub sp, sp
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ret void
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; CHECK: add sp, sp, #32
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; CHECK-NEXT: ldp x29, x30, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-TAIL: add sp, sp, #32
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; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
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; CHECK-TAIL-NEXT: add sp, sp, #16
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; CHECK-TAIL-NEXT: ret
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}
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define fastcc void @func_stack32([8 x i32], i128 %stacked0, i128 %stacked1) {
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; CHECK-LABEL: func_stack32:
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; CHECK: mov x29, sp
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; CHECK-TAIL-LABEL: func_stack32:
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; CHECK-TAIL: mov x29, sp
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call fastcc void @func_stack8([8 x i32] undef, i32 42)
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; CHECK: bl func_stack8
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack8
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; CHECK-TAIL: sub sp, sp, #16
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call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
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; CHECK: bl func_stack32
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; CHECK-NOT: sub sp, sp,
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; CHECK-TAIL: bl func_stack32
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; CHECK-TAIL: sub sp, sp, #32
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call fastcc void @func_stack0()
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; CHECK: bl func_stack0
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; CHECK-NOT: sub sp, sp
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; CHECK-TAIL: bl func_stack0
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; CHECK-TAIL-NOT: sub sp, sp
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ret void
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; CHECK: add sp, sp, #32
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; CHECK-NEXT: ldp x29, x30, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-TAIL: add sp, sp, #32
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; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
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; CHECK-TAIL-NEXT: add sp, sp, #32
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; CHECK-TAIL-NEXT: ret
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}
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; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
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define fastcc void @func_stack32_leaf([8 x i32], i128 %stacked0, i128 %stacked1) {
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; CHECK-LABEL: func_stack32_leaf:
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; CHECK: str x20, [sp, #-16]!
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; CHECK: nop
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; CHECK-NEXT: //NO_APP
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; CHECK-NEXT: ldr x20, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-TAIL-LABEL: func_stack32_leaf:
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; CHECK-TAIL: str x20, [sp, #-16]!
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; CHECK-TAIL: nop
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; CHECK-TAIL-NEXT: //NO_APP
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; CHECK-TAIL-NEXT: ldr x20, [sp], #16
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; CHECK-TAIL-NEXT: add sp, sp, #32
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; CHECK-TAIL-NEXT: ret
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; CHECK-TAIL-RZ-LABEL: func_stack32_leaf:
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; CHECK-TAIL-RZ: str x20, [sp, #-16]!
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; CHECK-TAIL-RZ-NOT: sub sp, sp
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; CHECK-TAIL-RZ: nop
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; CHECK-TAIL-RZ-NEXT: //NO_APP
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; CHECK-TAIL-RZ-NEXT: ldr x20, [sp], #16
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; CHECK-TAIL-RZ-NEXT: add sp, sp, #32
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; CHECK-TAIL-RZ-NEXT: ret
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; Make sure there is a callee-save register to save/restore.
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call void asm sideeffect "nop", "~{x20}"() nounwind
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ret void
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}
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; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
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define fastcc void @func_stack32_leaf_local([8 x i32], i128 %stacked0, i128 %stacked1) {
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; CHECK-LABEL: func_stack32_leaf_local:
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; CHECK: str x20, [sp, #-16]!
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; CHECK-NEXT: sub sp, sp, #16
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; CHECK: nop
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; CHECK-NEXT: //NO_APP
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; CHECK-NEXT: add sp, sp, #16
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; CHECK-NEXT: ldr x20, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-TAIL-LABEL: func_stack32_leaf_local:
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; CHECK-TAIL: str x20, [sp, #-16]!
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; CHECK-TAIL-NEXT: sub sp, sp, #16
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; CHECK-TAIL: nop
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; CHECK-TAIL-NEXT: //NO_APP
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; CHECK-TAIL-NEXT: add sp, sp, #16
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; CHECK-TAIL-NEXT: ldr x20, [sp], #16
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; CHECK-TAIL-NEXT: add sp, sp, #32
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; CHECK-TAIL-NEXT: ret
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; CHECK-TAIL-RZ-LABEL: func_stack32_leaf_local:
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; CHECK-TAIL-RZ: str x20, [sp, #-16]!
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; CHECK-TAIL-RZ-NOT: sub sp, sp
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; CHECK-TAIL-RZ: nop
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; CHECK-TAIL-RZ-NEXT: //NO_APP
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; CHECK-TAIL-RZ-NEXT: ldr x20, [sp], #16
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; CHECK-TAIL-RZ-NEXT: add sp, sp, #32
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; CHECK-TAIL-RZ-NEXT: ret
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%val0 = alloca [2 x i64], align 8
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; Make sure there is a callee-save register to save/restore.
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call void asm sideeffect "nop", "~{x20}"() nounwind
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ret void
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}
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; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
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define fastcc void @func_stack32_leaf_local_nocs([8 x i32], i128 %stacked0, i128 %stacked1) {
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; CHECK-LABEL: func_stack32_leaf_local_nocs:
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; CHECK: sub sp, sp, #16
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; CHECK: add sp, sp, #16
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; CHECK-NEXT: ret
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; CHECK-TAIL-LABEL: func_stack32_leaf_local_nocs:
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; CHECK-TAIL: sub sp, sp, #16
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; CHECK-TAIL: add sp, sp, #48
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; CHECK-TAIL-NEXT: ret
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; CHECK-TAIL-RZ-LABEL: func_stack32_leaf_local_nocs:
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; CHECK-TAIL-RZ: add sp, sp, #32
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; CHECK-TAIL-RZ-NEXT: ret
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%val0 = alloca [2 x i64], align 8
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ret void
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}
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