llvm-6502/test/CodeGen/X86/read-fp-no-frame-pointer.ll at ed5546e50bcd5a8263f16db34c5a58aa55b5eb3a - llvm-6502 - Applefritter: Git

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Pat Gavlin db5a82b861 Allow {e,r}bp as the target of {read,write}_register.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241827 91177308-0d34-0410-b5e6-96231b3b80d8

2015-07-09 17:40:29 +00:00

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LLVM

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 ; RUN: not llc < %s -mtriple=x86_64-linux-gnueabi 2>&1 | FileCheck %s
 define i32 @get_frame() nounwind {
 entry:
 ; CHECK: register ebp is allocatable: function has no frame pointer
   %fp = call i32 @llvm.read_register.i32(metadata !0)
   ret i32 %fp
 }
 declare i32 @llvm.read_register.i32(metadata) nounwind
 !0 = !{!"ebp\00"}