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a6d3ba4544
This patch allows the read_register and write_register intrinsics to read/write the RBP/EBP registers on X86 iff the targeted register is the frame pointer for the containing function. Differential Revision: http://reviews.llvm.org/D10977 llvm-svn: 241827
31 lines
884 B
LLVM
31 lines
884 B
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-linux-gnueabi | FileCheck %s
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; RUN: opt < %s -O3 -S -mtriple=x86_64-linux-gnueabi | FileCheck %s --check-prefix=OPT
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define i64 @get_frame() #0 {
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entry:
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; CHECK-LABEL: get_frame:
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; CHECK: movq %rbp, %rax
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%sp = call i64 @llvm.read_register.i64(metadata !0)
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; OPT: @llvm.read_register.i64
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ret i64 %sp
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}
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define void @set_frame(i64 %val) #0 {
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entry:
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; CHECK-LABEL: set_frame:
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; CHECK: movq %rdi, %rbp
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call void @llvm.write_register.i64(metadata !0, i64 %val)
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; OPT: @llvm.write_register.i64
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ret void
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}
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declare i64 @llvm.read_register.i64(metadata) nounwind
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declare void @llvm.write_register.i64(metadata, i64) nounwind
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; register unsigned long current_stack_pointer asm("rbp");
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; CHECK-NOT: .asciz "rbp"
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!0 = !{!"rbp\00"}
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attributes #0 = { nounwind "no-frame-pointer-elim"="true" }
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