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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
38 lines
1.1 KiB
LLVM
38 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios7.0 -disable-post-ra -disable-fp-elim | FileCheck %s
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; RUN: llc < %s -mtriple=arm64-linux-gnu -disable-post-ra | FileCheck %s --check-prefix=CHECK-LINUX
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; CHECK-LABEL: main:
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; CHECK: stp x29, x30, [sp, #-16]!
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; CHECK-NEXT: mov x29, sp
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; CHECK-NEXT: sub sp, sp, #16
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; CHECK-NEXT: stur wzr, [x29, #-4]
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; CHECK: adrp x0, L_.str@PAGE
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; CHECK: add x0, x0, L_.str@PAGEOFF
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; CHECK-NEXT: bl _puts
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; CHECK-NEXT: add sp, sp, #16
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; CHECK-NEXT: ldp x29, x30, [sp], #16
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; CHECK-NEXT: ret
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; CHECK-LINUX-LABEL: main:
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; CHECK-LINUX: str x30, [sp, #-16]!
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; CHECK-LINUX-NEXT: sub sp, sp, #16
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; CHECK-LINUX-NEXT: str wzr, [sp, #12]
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; CHECK-LINUX: adrp x0, .L.str
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; CHECK-LINUX: add x0, x0, :lo12:.L.str
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; CHECK-LINUX-NEXT: bl puts
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; CHECK-LINUX-NEXT: add sp, sp, #16
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; CHECK-LINUX-NEXT: ldr x30, [sp], #16
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; CHECK-LINUX-NEXT: ret
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@.str = private unnamed_addr constant [7 x i8] c"hello\0A\00"
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define i32 @main() nounwind ssp {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%call = call i32 @puts(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i32 0, i32 0))
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ret i32 %call
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}
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declare i32 @puts(i8*)
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