mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-22 09:29:31 +00:00
1a699b6833
This patch sets the 'KeepReg' bit for any tied and live registers during the PrescanInstruction() phase of the dependency breaking algorithm. It then checks those 'KeepReg' bits during the ScanInstruction() phase to avoid changing any tied registers. For more details, please see comments in: http://llvm.org/bugs/show_bug.cgi?id=20020 I added two FIXME comments for code that I think can be removed by using register iterators that include self. I don't want to include those code changes with this patch, however, to keep things as small as possible. The test case is larger than I'd like, but I don't know how to reduce it further and still produce the failing asm. Differential Revision: http://reviews.llvm.org/D4351 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212275 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
3.0 KiB
LLVM
74 lines
3.0 KiB
LLVM
; 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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