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a8cf55d334
This is useful for allowing code to efficiently take an address that can be later mapped onto debug info. Currently the hwasan pass achieves this by taking the address of the current function: http://llvm-cs.pcc.me.uk/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp#921 but this costs two instructions (plus a GOT entry in PIC code) per function with stack variables. This will allow the cost to be reduced to a single instruction. Differential Revision: https://reviews.llvm.org/D63471 llvm-svn: 364126
12 lines
244 B
LLVM
12 lines
244 B
LLVM
; RUN: llc < %s -mtriple=arm64-linux-gnu | FileCheck %s
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define i64 @read_pc() {
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; CHECK: adr x0, #0
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%pc = call i64 @llvm.read_register.i64(metadata !0)
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ret i64 %pc
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}
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declare i64 @llvm.read_register.i64(metadata) nounwind
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!0 = !{!"pc"}
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