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