1 ; RUN: llc < %s -mtriple=x86_64-apple-macosx -disable-lsr -post-RA-scheduler=1 -break-anti-dependencies=critical | FileCheck %s 2 3 ; In PR20020, the critical anti-dependency breaker algorithm mistakenly 4 ; 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 %rax 6 7 ; CHECK-NOT: xorl %ecx, %ecx 8 ; CHECK: leaq 1(%rax), %rcx 9 10 11 %struct.planet = type { double, double, double } 12 13 ; Function Attrs: nounwind ssp uwtable 14 define void @advance(i32 %nbodies, %struct.planet* nocapture %bodies) #0 { 15 entry: 16 %cmp4 = icmp sgt i32 %nbodies, 0 17 br i1 %cmp4, label %for.body.preheader, label %for.end38 18 19 for.body.preheader: ; preds = %entry 20 %gep = getelementptr %struct.planet, %struct.planet* %bodies, i64 1, i32 1 21 %gep13 = bitcast double* %gep to %struct.planet* 22 %0 = add i32 %nbodies, -1 23 br label %for.body 24 25 for.body: ; preds = %for.body.preheader, %for.inc20 26 %iv19 = phi i32 [ %0, %for.body.preheader ], [ %iv.next, %for.inc20 ] 27 %iv = phi %struct.planet* [ %gep13, %for.body.preheader ], [ %gep14, %for.inc20 ] 28 %iv9 = phi i64 [ %iv.next10, %for.inc20 ], [ 0, %for.body.preheader ] 29 %iv.next10 = add nuw nsw i64 %iv9, 1 30 %1 = trunc i64 %iv.next10 to i32 31 %cmp22 = icmp slt i32 %1, %nbodies 32 br i1 %cmp22, label %for.body3.lr.ph, label %for.inc20 33 34 for.body3.lr.ph: ; preds = %for.body 35 %x = getelementptr inbounds %struct.planet, %struct.planet* %bodies, i64 %iv9, i32 0 36 %y = getelementptr inbounds %struct.planet, %struct.planet* %bodies, i64 %iv9, i32 1 37 %vx = getelementptr inbounds %struct.planet, %struct.planet* %bodies, i64 %iv9, i32 2 38 br label %for.body3 39 40 for.body3: ; preds = %for.body3, %for.body3.lr.ph 41 %iv20 = phi i32 [ %iv.next21, %for.body3 ], [ %iv19, %for.body3.lr.ph ] 42 %iv15 = phi %struct.planet* [ %gep16, %for.body3 ], [ %iv, %for.body3.lr.ph ] 43 %iv1517 = bitcast %struct.planet* %iv15 to double* 44 %2 = load double, double* %x, align 8 45 %gep18 = getelementptr double, double* %iv1517, i64 -1 46 %3 = load double, double* %gep18, align 8 47 %sub = fsub double %2, %3 48 %4 = load double, double* %y, align 8 49 %5 = load double, double* %iv1517, align 8 50 %sub8 = fsub double %4, %5 51 %add10 = fadd double %sub, %sub8 52 %call = tail call double @sqrt(double %sub8) #2 53 store double %add10, double* %vx, align 8 54 %gep16 = getelementptr %struct.planet, %struct.planet* %iv15, i64 1 55 %iv.next21 = add i32 %iv20, -1 56 %exitcond = icmp eq i32 %iv.next21, 0 57 br i1 %exitcond, label %for.inc20, label %for.body3 58 59 for.inc20: ; preds = %for.body3, %for.body 60 %lftr.wideiv11 = trunc i64 %iv.next10 to i32 61 %gep14 = getelementptr %struct.planet, %struct.planet* %iv, i64 1 62 %iv.next = add i32 %iv19, -1 63 %exitcond12 = icmp eq i32 %lftr.wideiv11, %nbodies 64 br i1 %exitcond12, label %for.end38, label %for.body 65 66 for.end38: ; preds = %for.inc20, %entry 67 ret void 68 } 69 70 ; Function Attrs: nounwind 71 declare double @sqrt(double) #1 72 73 attributes #0 = { "no-frame-pointer-elim-non-leaf" } 74
