File: read-reg.ll

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llvm-toolchain-21 1%3A21.1.6-3
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; RUN: opt -S -passes=early-cse -earlycse-debug-hash < %s | FileCheck %s
; RUN: opt -S -passes='early-cse<memssa>' < %s | FileCheck %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"

; Function Attrs: nounwind
define i64 @f(i64 %x) #0 {
entry:
  %0 = call i64 @llvm.read_register.i64(metadata !0)
  call void @foo()
  %1 = call i64 @llvm.read_register.i64(metadata !0)
  %add = add nsw i64 %0, %1
  ret i64 %add
}

; CHECK-LABEL: @f
; CHECK: call i64 @llvm.read_register.i64
; CHECK: call i64 @llvm.read_register.i64

; Function Attrs: nounwind readnone
declare i64 @llvm.read_register.i64(metadata) #1

; Function Attrs: nounwind
declare void @llvm.write_register.i64(metadata, i64) #2

declare void @foo(...)

attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }

!llvm.named.register.r1 = !{!0}

!0 = !{!"r1"}