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8e0ed2340c
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
62 lines
1.6 KiB
LLVM
62 lines
1.6 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s
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; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -disable-fp-elim | FileCheck -check-prefix CHECK-WITHFP-ARM64 %s
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; Make sure a reasonably sane prologue and epilogue are
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; generated. This test is not robust in the face of an frame-handling
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; evolving, but still has value for unrelated changes, I
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; believe.
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;
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; In particular, it will fail when ldp/stp are used for frame setup,
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; when FP-elim is implemented, and when addressing from FP is
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; implemented.
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@var = global i64 0
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@local_addr = global i64* null
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declare void @foo()
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define void @trivial_func() nounwind {
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; CHECK-LABEL: trivial_func: // @trivial_func
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; CHECK-NEXT: // BB#0
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; CHECK-NEXT: ret
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ret void
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}
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define void @trivial_fp_func() {
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; CHECK-LABEL: trivial_fp_func:
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; CHECK: str x30, [sp, #-16]!
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; CHECK-NOT: mov x29, sp
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; CHECK-WITHFP-ARM64-LABEL: trivial_fp_func:
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; CHECK-WITHFP-ARM64: stp x29, x30, [sp, #-16]!
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; CHECK-WITHFP-ARM64-NEXT: mov x29, sp
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; Dont't really care, but it would be a Bad Thing if this came after the epilogue.
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; CHECK-WITHFP-ARM64: bl foo
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; CHECK: bl foo
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call void @foo()
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ret void
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; CHECK: ldr x30, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-WITHFP-ARM64: ldp x29, x30, [sp], #16
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; CHECK-WITHFP-ARM64-NEXT: ret
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}
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define void @stack_local() {
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%local_var = alloca i64
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; CHECK-LABEL: stack_local:
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; CHECK: sub sp, sp, #16
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%val = load i64, i64* @var
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store i64 %val, i64* %local_var
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; CHECK-DAG: str {{x[0-9]+}}, [sp, #{{[0-9]+}}]
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store i64* %local_var, i64** @local_addr
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; CHECK-DAG: add {{x[0-9]+}}, sp, #{{[0-9]+}}
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ret void
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}
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