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; RUN: llc < %s -mtriple=x86_64-apple-macosx -disable-lsr -post-RA-scheduler=1 -break-anti-dependencies=critical | FileCheck %s
; In PR20020, the critical anti-dependency breaker algorithm mistakenly
; changes the register operands of an 'xorl %eax, %eax' to 'xorl %ecx, %ecx'
; and then immediately reloads %rcx with a value based on the wrong %rax
; CHECK-NOT: xorl %ecx, %ecx
; CHECK: leaq 1(%rax), %rcx
%struct.planet = type { double, double, double }
; Function Attrs: nounwind ssp uwtable
define void @advance(i32 %nbodies, %struct.planet* nocapture %bodies) #0 {
entry:
%cmp4 = icmp sgt i32 %nbodies, 0
br i1 %cmp4, label %for.body.preheader, label %for.end38
for.body.preheader: ; preds = %entry
%gep = getelementptr %struct.planet* %bodies, i64 1, i32 1
%gep13 = bitcast double* %gep to %struct.planet*
%0 = add i32 %nbodies, -1
br label %for.body
for.body: ; preds = %for.body.preheader, %for.inc20
%iv19 = phi i32 [ %0, %for.body.preheader ], [ %iv.next, %for.inc20 ]
%iv = phi %struct.planet* [ %gep13, %for.body.preheader ], [ %gep14, %for.inc20 ]
%iv9 = phi i64 [ %iv.next10, %for.inc20 ], [ 0, %for.body.preheader ]
%iv.next10 = add nuw nsw i64 %iv9, 1
%1 = trunc i64 %iv.next10 to i32
%cmp22 = icmp slt i32 %1, %nbodies
br i1 %cmp22, label %for.body3.lr.ph, label %for.inc20
for.body3.lr.ph: ; preds = %for.body
%x = getelementptr inbounds %struct.planet* %bodies, i64 %iv9, i32 0
%y = getelementptr inbounds %struct.planet* %bodies, i64 %iv9, i32 1
%vx = getelementptr inbounds %struct.planet* %bodies, i64 %iv9, i32 2
br label %for.body3
for.body3: ; preds = %for.body3, %for.body3.lr.ph
%iv20 = phi i32 [ %iv.next21, %for.body3 ], [ %iv19, %for.body3.lr.ph ]
%iv15 = phi %struct.planet* [ %gep16, %for.body3 ], [ %iv, %for.body3.lr.ph ]
%iv1517 = bitcast %struct.planet* %iv15 to double*
%2 = load double* %x, align 8
%gep18 = getelementptr double* %iv1517, i64 -1
%3 = load double* %gep18, align 8
%sub = fsub double %2, %3
%4 = load double* %y, align 8
%5 = load double* %iv1517, align 8
%sub8 = fsub double %4, %5
%add10 = fadd double %sub, %sub8
%call = tail call double @sqrt(double %sub8) #2
store double %add10, double* %vx, align 8
%gep16 = getelementptr %struct.planet* %iv15, i64 1
%iv.next21 = add i32 %iv20, -1
%exitcond = icmp eq i32 %iv.next21, 0
br i1 %exitcond, label %for.inc20, label %for.body3
for.inc20: ; preds = %for.body3, %for.body
%lftr.wideiv11 = trunc i64 %iv.next10 to i32
%gep14 = getelementptr %struct.planet* %iv, i64 1
%iv.next = add i32 %iv19, -1
%exitcond12 = icmp eq i32 %lftr.wideiv11, %nbodies
br i1 %exitcond12, label %for.end38, label %for.body
for.end38: ; preds = %for.inc20, %entry
ret void
}
; Function Attrs: nounwind
declare double @sqrt(double) #1
attributes #0 = { "no-frame-pointer-elim-non-leaf" }
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