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llvm-mirror/test/CodeGen/AArch64/fastcc.ll
Geoff Berry 8e0ed2340c [AArch64] Enable non-leaf frame pointer elimination. 
Summary:
This change enables frame pointer elimination in non-leaf functions.
The -fomit-frame-pointer option still needs to be used when compiling
via clang (or an equivalent method of not setting the
'no-frame-pointer-elim*' function attributes if generating llvm IR via
some other method) to take advantage of this optimization.

This change should be NFC when compiling via clang without
-fomit-frame-pointer.

Reviewers: t.p.northover

Subscribers: aemerson, rengolin, tberghammer, qcolombet, llvm-commits, danalbert, mcrosier, srhines

Differential Revision: http://reviews.llvm.org/D17730

llvm-svn: 262495
2016-03-02 17:58:31 +00:00

237 lines
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; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim -tailcallopt | FileCheck %s -check-prefix CHECK-TAIL
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim | FileCheck %s
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim -tailcallopt -aarch64-redzone | FileCheck %s -check-prefix CHECK-TAIL-RZ
; Without tailcallopt fastcc still means the caller cleans up the
; stack, so try to make sure this is respected.
define fastcc void @func_stack0() {
; CHECK-LABEL: func_stack0:
; CHECK: mov x29, sp
; CHECK: str w{{[0-9]+}}, [sp, #-32]!
; CHECK-TAIL-LABEL: func_stack0:
; CHECK-TAIL: stp x29, x30, [sp, #-16]!
; CHECK-TAIL-NEXT: mov x29, sp
; CHECK-TAIL: str w{{[0-9]+}}, [sp, #-32]!
call fastcc void @func_stack8([8 x i32] undef, i32 42)
; CHECK: bl func_stack8
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack8
; CHECK-TAIL: sub sp, sp, #16
call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
; CHECK: bl func_stack32
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack32
; CHECK-TAIL: sub sp, sp, #32
call fastcc void @func_stack0()
; CHECK: bl func_stack0
; CHECK-NOT: sub sp, sp
; CHECK-TAIL: bl func_stack0
; CHECK-TAIL-NOT: sub sp, sp
ret void
; CHECK: mov sp, x29
; CHECK-NEXT: ldp x29, x30, [sp], #16
; CHECK-NEXT: ret
; CHECK-TAIL: mov sp, x29
; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
; CHECK-TAIL-NEXT: ret
}
define fastcc void @func_stack8([8 x i32], i32 %stacked) {
; CHECK-LABEL: func_stack8:
; CHECK: stp x29, x30, [sp, #-16]!
; CHECK: mov x29, sp
; CHECK: str w{{[0-9]+}}, [sp, #-32]!
; CHECK-TAIL-LABEL: func_stack8:
; CHECK-TAIL: stp x29, x30, [sp, #-16]!
; CHECK-TAIL: mov x29, sp
; CHECK-TAIL: str w{{[0-9]+}}, [sp, #-32]!
call fastcc void @func_stack8([8 x i32] undef, i32 42)
; CHECK: bl func_stack8
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack8
; CHECK-TAIL: sub sp, sp, #16
call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
; CHECK: bl func_stack32
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack32
; CHECK-TAIL: sub sp, sp, #32
call fastcc void @func_stack0()
; CHECK: bl func_stack0
; CHECK-NOT: sub sp, sp
; CHECK-TAIL: bl func_stack0
; CHECK-TAIL-NOT: sub sp, sp
ret void
; CHECK: mov sp, x29
; CHECK-NEXT: ldp x29, x30, [sp], #16
; CHECK-NEXT: ret
; CHECK-TAIL: mov sp, x29
; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
; CHECK-TAIL-NEXT: add sp, sp, #16
; CHECK-TAIL-NEXT: ret
}
define fastcc void @func_stack32([8 x i32], i128 %stacked0, i128 %stacked1) {
; CHECK-LABEL: func_stack32:
; CHECK: mov x29, sp
; CHECK-TAIL-LABEL: func_stack32:
; CHECK-TAIL: mov x29, sp
call fastcc void @func_stack8([8 x i32] undef, i32 42)
; CHECK: bl func_stack8
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack8
; CHECK-TAIL: sub sp, sp, #16
call fastcc void @func_stack32([8 x i32] undef, i128 0, i128 9)
; CHECK: bl func_stack32
; CHECK-NOT: sub sp, sp,
; CHECK-TAIL: bl func_stack32
; CHECK-TAIL: sub sp, sp, #32
call fastcc void @func_stack0()
; CHECK: bl func_stack0
; CHECK-NOT: sub sp, sp
; CHECK-TAIL: bl func_stack0
; CHECK-TAIL-NOT: sub sp, sp
ret void
; CHECK: mov sp, x29
; CHECK-NEXT: ldp x29, x30, [sp], #16
; CHECK-NEXT: ret
; CHECK-TAIL: mov sp, x29
; CHECK-TAIL-NEXT: ldp x29, x30, [sp], #16
; CHECK-TAIL-NEXT: add sp, sp, #32
; CHECK-TAIL-NEXT: ret
}
; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
define fastcc void @func_stack32_leaf([8 x i32], i128 %stacked0, i128 %stacked1) {
; CHECK-LABEL: func_stack32_leaf:
; CHECK: str x20, [sp, #-16]!
; CHECK: nop
; CHECK-NEXT: //NO_APP
; CHECK-NEXT: ldr x20, [sp], #16
; CHECK-NEXT: ret
; CHECK-TAIL-LABEL: func_stack32_leaf:
; CHECK-TAIL: str x20, [sp, #-16]!
; CHECK-TAIL: nop
; CHECK-TAIL-NEXT: //NO_APP
; CHECK-TAIL-NEXT: ldr x20, [sp], #16
; CHECK-TAIL-NEXT: add sp, sp, #32
; CHECK-TAIL-NEXT: ret
; CHECK-TAIL-RZ-LABEL: func_stack32_leaf:
; CHECK-TAIL-RZ: str x20, [sp, #-16]!
; CHECK-TAIL-RZ-NOT: sub sp, sp
; CHECK-TAIL-RZ: nop
; CHECK-TAIL-RZ-NEXT: //NO_APP
; CHECK-TAIL-RZ-NEXT: ldr x20, [sp], #16
; CHECK-TAIL-RZ-NEXT: add sp, sp, #32
; CHECK-TAIL-RZ-NEXT: ret
; Make sure there is a callee-save register to save/restore.
call void asm sideeffect "nop", "~{x20}"() nounwind
ret void
}
; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
define fastcc void @func_stack32_leaf_local([8 x i32], i128 %stacked0, i128 %stacked1) {
; CHECK-LABEL: func_stack32_leaf_local:
; CHECK: str x20, [sp, #-16]!
; CHECK-NEXT: sub sp, sp, #16
; CHECK: nop
; CHECK-NEXT: //NO_APP
; CHECK-NEXT: add sp, sp, #16
; CHECK-NEXT: ldr x20, [sp], #16
; CHECK-NEXT: ret
; CHECK-TAIL-LABEL: func_stack32_leaf_local:
; CHECK-TAIL: str x20, [sp, #-16]!
; CHECK-TAIL-NEXT: sub sp, sp, #16
; CHECK-TAIL: nop
; CHECK-TAIL-NEXT: //NO_APP
; CHECK-TAIL-NEXT: add sp, sp, #16
; CHECK-TAIL-NEXT: ldr x20, [sp], #16
; CHECK-TAIL-NEXT: add sp, sp, #32
; CHECK-TAIL-NEXT: ret
; CHECK-TAIL-RZ-LABEL: func_stack32_leaf_local:
; CHECK-TAIL-RZ: str x20, [sp, #-16]!
; CHECK-TAIL-RZ-NOT: sub sp, sp
; CHECK-TAIL-RZ: nop
; CHECK-TAIL-RZ-NEXT: //NO_APP
; CHECK-TAIL-RZ-NEXT: ldr x20, [sp], #16
; CHECK-TAIL-RZ-NEXT: add sp, sp, #32
; CHECK-TAIL-RZ-NEXT: ret
%val0 = alloca [2 x i64], align 8
; Make sure there is a callee-save register to save/restore.
call void asm sideeffect "nop", "~{x20}"() nounwind
ret void
}
; Check that arg stack pop is done after callee-save restore when no frame pointer is used.
define fastcc void @func_stack32_leaf_local_nocs([8 x i32], i128 %stacked0, i128 %stacked1) {
; CHECK-LABEL: func_stack32_leaf_local_nocs:
; CHECK: sub sp, sp, #16
; CHECK: add sp, sp, #16
; CHECK-NEXT: ret
; CHECK-TAIL-LABEL: func_stack32_leaf_local_nocs:
; CHECK-TAIL: sub sp, sp, #16
; CHECK-TAIL: add sp, sp, #48
; CHECK-TAIL-NEXT: ret
; CHECK-TAIL-RZ-LABEL: func_stack32_leaf_local_nocs:
; CHECK-TAIL-RZ: add sp, sp, #32
; CHECK-TAIL-RZ-NEXT: ret
%val0 = alloca [2 x i64], align 8
ret void
}
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