https://llvm.org/bugs/show_bug.cgi?id=25171
Bug ID: 25171
Summary: wrong code generated for monotonic loads and stores
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@d = global double 0.000000e+00, align 8
define void @_Z1fv() #0 {
entry:
%0 = load atomic i64, i64* bitcast (double* @d to i64*) monotonic, align 8
%1 = bitcast i64 %0 to double
%add = fadd double %1, 1.000000e+00
%2 = bitcast double %add to i64
store atomic i64 %2, i64* bitcast (double* @d to i64*) monotonic, align 8
ret void
}
attributes #0 = { nounwind uwtable "disable-tail-calls"="false"
"less-precise-fpmad"="false" "no-frame-pointer-elim"="false"
"no-infs-fp-math"="false" "no-nans-fp-math"="false"
"stack-protector-buffer-size"="8" "target-cpu"="x86-64"
"target-features"="+mmx,+sse,+sse2" "unsafe-fp-math"="false"
"use-soft-float"="false" }
Generates:
_Z1fv: # @_Z1fv
movsd .LCPI0_0(%rip), %xmm0 # xmm0 = mem[0],zero
addsd (%rip), %xmm0
movsd %xmm0, (%rip)
retq
Instead of loading and storing @d, we load and store over random instructions
within 'f'.
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