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c0457f68d4
Enable the SystemZ back-end to lower FRAMEADDR and RETURNADDR, which previously would cause the back-end to crash. Currently, only a frame count of zero is supported. Author: bryanpkc Differential Revision: http://reviews.llvm.org/D18514 llvm-svn: 265291
29 lines
686 B
LLVM
29 lines
686 B
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; The current function's frame address is the address of
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; the optional back chain slot.
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define i8* @fp0() nounwind {
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entry:
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; CHECK-LABEL: fp0:
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; CHECK: la %r2, 0(%r15)
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; CHECK: br %r14
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%0 = tail call i8* @llvm.frameaddress(i32 0)
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ret i8* %0
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}
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; Check that the frame address is correct in a presence
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; of a stack frame.
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define i8* @fp0f() nounwind {
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entry:
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; CHECK-LABEL: fp0f:
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; CHECK: aghi %r15, -168
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; CHECK: la %r2, 168(%r15)
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; CHECK: aghi %r15, 168
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; CHECK: br %r14
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%0 = alloca i64, align 8
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%1 = tail call i8* @llvm.frameaddress(i32 0)
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ret i8* %1
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}
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declare i8* @llvm.frameaddress(i32) nounwind readnone
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