[PATCH] D73940: GlobalISel: Reimplement moreElementsVectorDst
Matt Arsenault via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jul 9 11:42:52 PDT 2020
arsenm updated this revision to Diff 276791.
arsenm added a comment.
Fix backwards diff
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D73940/new/
https://reviews.llvm.org/D73940
Files:
llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
Index: llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1272,10 +1272,8 @@
void LegalizerHelper::moreElementsVectorDst(MachineInstr &MI, LLT WideTy,
unsigned OpIdx) {
MachineOperand &MO = MI.getOperand(OpIdx);
- Register DstExt = MRI.createGenericVirtualRegister(WideTy);
MIRBuilder.setInsertPt(MIRBuilder.getMBB(), ++MIRBuilder.getInsertPt());
- MIRBuilder.buildExtract(MO, DstExt, 0);
- MO.setReg(DstExt);
+ MO.setReg(widenWithUnmerge(WideTy, MO.getReg()));
}
void LegalizerHelper::moreElementsVectorSrc(MachineInstr &MI, LLT MoreTy,
@@ -1443,6 +1441,40 @@
return Legalized;
}
+Register LegalizerHelper::widenWithUnmerge(LLT WideTy, Register OrigReg) {
+ Register WideReg = MRI.createGenericVirtualRegister(WideTy);
+ LLT OrigTy = MRI.getType(OrigReg);
+ LLT LCMTy = getLCMType(WideTy, OrigTy);
+
+ const int NumMergeParts = LCMTy.getSizeInBits() / WideTy.getSizeInBits();
+ const int NumUnmergeParts = LCMTy.getSizeInBits() / OrigTy.getSizeInBits();
+
+ Register UnmergeSrc = WideReg;
+
+ // Create a merge to the LCM type, padding with undef
+ // %0:_(<3 x s32>) = G_FOO => <4 x s32>
+ // =>
+ // %1:_(<4 x s32>) = G_FOO
+ // %2:_(<4 x s32>) = G_IMPLICIT_DEF
+ // %3:_(<12 x s32>) = G_CONCAT_VECTORS %1, %2, %2
+ // %0:_(<3 x s32>), %4:_, %5:_, %6:_ = G_UNMERGE_VALUES %3
+ if (NumMergeParts > 1) {
+ Register Undef = MIRBuilder.buildUndef(WideTy).getReg(0);
+ SmallVector<Register, 8> MergeParts(NumMergeParts, Undef);
+ MergeParts[0] = WideReg;
+ UnmergeSrc = MIRBuilder.buildMerge(LCMTy, MergeParts).getReg(0);
+ }
+
+ // Unmerge to the original register and pad with dead defs.
+ SmallVector<Register, 8> UnmergeResults(NumUnmergeParts);
+ UnmergeResults[0] = OrigReg;
+ for (int I = 1; I != NumUnmergeParts; ++I)
+ UnmergeResults[I] = MRI.createGenericVirtualRegister(OrigTy);
+
+ MIRBuilder.buildUnmerge(UnmergeResults, UnmergeSrc);
+ return WideReg;
+}
+
LegalizerHelper::LegalizeResult
LegalizerHelper::widenScalarUnmergeValues(MachineInstr &MI, unsigned TypeIdx,
LLT WideTy) {
Index: llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
===================================================================
--- llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
+++ llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
@@ -154,6 +154,10 @@
/// def by inserting a G_BITCAST from \p CastTy
void bitcastDst(MachineInstr &MI, LLT CastTy, unsigned OpIdx);
+ /// Widen \p OrigReg to \p WideTy by merging to a wider type, padding with
+ /// G_IMPLICIT_DEF, and producing dead results.
+ Register widenWithUnmerge(LLT WideTy, Register OrigReg);
+
private:
LegalizeResult
widenScalarMergeValues(MachineInstr &MI, unsigned TypeIdx, LLT WideTy);
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