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1; RUN: llc < %s -mtriple=x86_64-apple-macosx -disable-lsr -post-RA-scheduler=1 -break-anti-dependencies=critical | FileCheck %s2 3; In PR20020, the critical anti-dependency breaker algorithm mistakenly4; changes the register operands of an 'xorl %eax, %eax' to 'xorl %ecx, %ecx'5; and then immediately reloads %rcx with a value based on the wrong %rax6 7; CHECK-NOT: xorl %ecx, %ecx8; CHECK: leaq 1(%rax), %rcx9 10 11%struct.planet = type { double, double, double }12 13; Function Attrs: nounwind ssp uwtable14define void @advance(i32 %nbodies, ptr nocapture %bodies) #0 {15entry:16 %cmp4 = icmp sgt i32 %nbodies, 017 br i1 %cmp4, label %for.body.preheader, label %for.end3818 19for.body.preheader: ; preds = %entry20 %gep = getelementptr %struct.planet, ptr %bodies, i64 1, i32 121 %0 = add i32 %nbodies, -122 br label %for.body23 24for.body: ; preds = %for.body.preheader, %for.inc2025 %iv19 = phi i32 [ %0, %for.body.preheader ], [ %iv.next, %for.inc20 ]26 %iv = phi ptr [ %gep, %for.body.preheader ], [ %gep14, %for.inc20 ]27 %iv9 = phi i64 [ %iv.next10, %for.inc20 ], [ 0, %for.body.preheader ]28 %iv.next10 = add nuw nsw i64 %iv9, 129 %1 = trunc i64 %iv.next10 to i3230 %cmp22 = icmp slt i32 %1, %nbodies31 br i1 %cmp22, label %for.body3.lr.ph, label %for.inc2032 33for.body3.lr.ph: ; preds = %for.body34 %x = getelementptr inbounds %struct.planet, ptr %bodies, i64 %iv9, i32 035 %y = getelementptr inbounds %struct.planet, ptr %bodies, i64 %iv9, i32 136 %vx = getelementptr inbounds %struct.planet, ptr %bodies, i64 %iv9, i32 237 br label %for.body338 39for.body3: ; preds = %for.body3, %for.body3.lr.ph40 %iv20 = phi i32 [ %iv.next21, %for.body3 ], [ %iv19, %for.body3.lr.ph ]41 %iv15 = phi ptr [ %gep16, %for.body3 ], [ %iv, %for.body3.lr.ph ]42 %2 = load double, ptr %x, align 843 %gep18 = getelementptr double, ptr %iv15, i64 -144 %3 = load double, ptr %gep18, align 845 %sub = fsub double %2, %346 %4 = load double, ptr %y, align 847 %5 = load double, ptr %iv15, align 848 %sub8 = fsub double %4, %549 %add10 = fadd double %sub, %sub850 %call = tail call double @sqrt(double %sub8) #251 store double %add10, ptr %vx, align 852 %gep16 = getelementptr %struct.planet, ptr %iv15, i64 153 %iv.next21 = add i32 %iv20, -154 %exitcond = icmp eq i32 %iv.next21, 055 br i1 %exitcond, label %for.inc20, label %for.body356 57for.inc20: ; preds = %for.body3, %for.body58 %lftr.wideiv11 = trunc i64 %iv.next10 to i3259 %gep14 = getelementptr %struct.planet, ptr %iv, i64 160 %iv.next = add i32 %iv19, -161 %exitcond12 = icmp eq i32 %lftr.wideiv11, %nbodies62 br i1 %exitcond12, label %for.end38, label %for.body63 64for.end38: ; preds = %for.inc20, %entry65 ret void66}67 68; Function Attrs: nounwind69declare double @sqrt(double) #170 71attributes #0 = { "frame-pointer"="non-leaf" }72