Be more careful with insert_subreg and extract_subreg where either source or destination operand has already been coalesced with another register that's defined by a insert_subreg or extract_subreg.
llvm-svn: 49843
This commit is contained in:
Evan Cheng
parent
f9ae76d89c
commit
7e4a55bc58
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@ -849,20 +849,28 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
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// r1024 = EXTRACT_SUBREG EAX, 0 then r1024 is really going to be
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// coalesced with AX.
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unsigned DstSubIdx = CopyMI->getOperand(0).getSubReg();
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assert(!DstSubIdx || DstSubIdx == SubIdx);
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if (DstSubIdx != SubIdx)
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// r1024<2> = EXTRACT_SUBREG EAX, 0. Then r1024 has already been
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// coalesced to an INSERT_SUBREG so the subreg indices cancel out.
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if (DstSubIdx) {
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// r1024<2> = EXTRACT_SUBREG EAX, 2. Then r1024 has already been
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// coalesced to a larger register so the subreg indices cancel out.
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if (DstSubIdx != SubIdx) {
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DOUT << "\t Sub-register indices mismatch.\n";
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return false; // Not coalescable.
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}
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} else
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SrcReg = tri_->getSubReg(SrcReg, SubIdx);
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SubIdx = 0;
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} else if (DstIsPhys && isInsSubReg) {
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// EAX = INSERT_SUBREG EAX, r1024, 0
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unsigned SrcSubIdx = CopyMI->getOperand(2).getSubReg();
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assert(!SrcSubIdx || SrcSubIdx == SubIdx);
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if (SrcSubIdx != SubIdx)
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// EAX = INSERT_SUBREG EAX, r1024<2>, 0 Then r1024 has already been
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// coalesced to an EXTRACT_SUBREG so the subreg indices cancel out.
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DstReg = tri_->getSubReg(DstReg, SubIdx);
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if (SrcSubIdx) {
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// EAX = INSERT_SUBREG EAX, r1024<2>, 2 Then r1024 has already been
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// coalesced to a larger register so the subreg indices cancel out.
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if (SrcSubIdx != SubIdx) {
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DOUT << "\t Sub-register indices mismatch.\n";
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return false; // Not coalescable.
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}
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} else
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DstReg = tri_->getSubReg(DstReg, SubIdx);
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SubIdx = 0;
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} else if ((DstIsPhys && isExtSubReg) || (SrcIsPhys && isInsSubReg)) {
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// If this is a extract_subreg where dst is a physical register, e.g.
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@ -870,6 +878,11 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
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// then create and update the actual physical register allocated to RHS.
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// Ditto for
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// reg1024 = INSERT_SUBREG r1024, cl, 1
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if (CopyMI->getOperand(1).getSubReg()) {
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DOUT << "\tSrc of extract_ / insert_subreg already coalesced with reg"
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<< " of a super-class.\n";
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return false; // Not coalescable.
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}
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const TargetRegisterClass *RC =
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mri_->getRegClass(isExtSubReg ? SrcReg : DstReg);
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if (isExtSubReg) {
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@ -899,24 +912,38 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
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}
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SubIdx = 0;
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} else {
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unsigned LargeReg = isExtSubReg ? SrcReg : DstReg;
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unsigned SmallReg = isExtSubReg ? DstReg : SrcReg;
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unsigned LargeRegSize =
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li_->getInterval(LargeReg).getSize() / InstrSlots::NUM;
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unsigned SmallRegSize =
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li_->getInterval(SmallReg).getSize() / InstrSlots::NUM;
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const TargetRegisterClass *RC = mri_->getRegClass(SmallReg);
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unsigned Threshold = allocatableRCRegs_[RC].count();
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// Be conservative. If both sides are virtual registers, do not coalesce
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// if this will cause a high use density interval to target a smaller set
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// of registers.
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if (SmallRegSize > Threshold || LargeRegSize > Threshold) {
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LiveVariables::VarInfo &svi = lv_->getVarInfo(LargeReg);
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LiveVariables::VarInfo &dvi = lv_->getVarInfo(SmallReg);
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if ((float)dvi.NumUses / SmallRegSize <
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(float)svi.NumUses / LargeRegSize) {
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Again = true; // May be possible to coalesce later.
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return false;
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unsigned OldSubIdx = isExtSubReg ? CopyMI->getOperand(0).getSubReg()
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: CopyMI->getOperand(2).getSubReg();
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if (OldSubIdx) {
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if (OldSubIdx == SubIdx)
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// r1024<2> = EXTRACT_SUBREG r1025, 2. Then r1024 has already been
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// coalesced to a larger register so the subreg indices cancel out.
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SubIdx = 0;
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else {
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DOUT << "\t Sub-register indices mismatch.\n";
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return false; // Not coalescable.
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}
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}
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if (SubIdx) {
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unsigned LargeReg = isExtSubReg ? SrcReg : DstReg;
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unsigned SmallReg = isExtSubReg ? DstReg : SrcReg;
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unsigned LargeRegSize =
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li_->getInterval(LargeReg).getSize() / InstrSlots::NUM;
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unsigned SmallRegSize =
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li_->getInterval(SmallReg).getSize() / InstrSlots::NUM;
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const TargetRegisterClass *RC = mri_->getRegClass(SmallReg);
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unsigned Threshold = allocatableRCRegs_[RC].count();
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// Be conservative. If both sides are virtual registers, do not coalesce
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// if this will cause a high use density interval to target a smaller
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// set of registers.
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if (SmallRegSize > Threshold || LargeRegSize > Threshold) {
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LiveVariables::VarInfo &svi = lv_->getVarInfo(LargeReg);
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LiveVariables::VarInfo &dvi = lv_->getVarInfo(SmallReg);
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if ((float)dvi.NumUses / SmallRegSize <
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(float)svi.NumUses / LargeRegSize) {
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Again = true; // May be possible to coalesce later.
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return false;
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}
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}
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}
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}
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@ -0,0 +1,171 @@
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; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | grep xorl | grep {%e}
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; Make sure xorl operands are 32-bit registers.
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%struct.tm = type { i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i8* }
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%struct.wxDateTime = type { %struct.wxLongLong }
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%"struct.wxDateTime::TimeZone" = type { i32 }
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%struct.wxLongLong = type { i64 }
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%struct.wxString = type { %struct.wxStringBase }
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%struct.wxStringBase = type { i32* }
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@.str = external constant [27 x i32] ; <[27 x i32]*> [#uses=1]
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@.str4 = external constant [14 x i32] ; <[14 x i32]*> [#uses=1]
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@_ZZNK10wxDateTime5GetTmERKNS_8TimeZoneEE12__FUNCTION__ = external constant [6 x i8] ; <[6 x i8]*> [#uses=1]
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@.str33 = external constant [29 x i32] ; <[29 x i32]*> [#uses=1]
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@.str89 = external constant [5 x i32] ; <[5 x i32]*> [#uses=1]
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define void @_ZNK10wxDateTime6FormatEPKwRKNS_8TimeZoneE(%struct.wxString* noalias sret %agg.result, %struct.wxDateTime* %this, i32* %format, %"struct.wxDateTime::TimeZone"* %tz) {
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entry:
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br i1 false, label %bb116.i, label %bb115.critedge.i
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bb115.critedge.i: ; preds = %entry
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ret void
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bb116.i: ; preds = %entry
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br i1 false, label %bb52.i.i, label %bb3118
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bb3118: ; preds = %bb116.i
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ret void
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bb52.i.i: ; preds = %bb116.i
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br i1 false, label %bb142.i, label %bb115.critedge.i.i
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bb115.critedge.i.i: ; preds = %bb52.i.i
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ret void
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bb142.i: ; preds = %bb52.i.i
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br i1 false, label %bb161.i, label %bb182.i
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bb161.i: ; preds = %bb142.i
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br label %bb3261
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bb182.i: ; preds = %bb142.i
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ret void
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bb3261: ; preds = %bb7834, %bb161.i
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%tmp3263 = load i32* null, align 4 ; <i32> [#uses=1]
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%tmp3264 = icmp eq i32 %tmp3263, 37 ; <i1> [#uses=1]
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br i1 %tmp3264, label %bb3306, label %bb3267
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bb3267: ; preds = %bb3261
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ret void
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bb3306: ; preds = %bb3261
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%tmp3310 = invoke %struct.wxStringBase* @_ZN12wxStringBaseaSEPKw( %struct.wxStringBase* null, i32* getelementptr ([5 x i32]* @.str89, i32 0, i32 0) )
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to label %bb3314 unwind label %lpad ; <%struct.wxStringBase*> [#uses=0]
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bb3314: ; preds = %bb3306
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%tmp3316 = load i32* null, align 4 ; <i32> [#uses=1]
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switch i32 %tmp3316, label %bb7595 [
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i32 0, label %bb7819
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i32 37, label %bb7806
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i32 66, label %bb3477
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i32 72, label %bb5334
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i32 73, label %bb5484
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i32 77, label %bb6118
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i32 83, label %bb6406
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i32 85, label %bb6556
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i32 87, label %bb6708
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i32 89, label %bb7308
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i32 98, label %bb3477
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i32 99, label %bb3626
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i32 100, label %bb5184
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i32 106, label %bb5657
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i32 108, label %bb5809
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i32 109, label %bb5968
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i32 119, label %bb6860
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i32 120, label %bb3626
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i32 121, label %bb7158
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]
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bb3477: ; preds = %bb3314, %bb3314
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ret void
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bb3626: ; preds = %bb3314, %bb3314
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ret void
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bb5184: ; preds = %bb3314
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ret void
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bb5334: ; preds = %bb3314
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ret void
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bb5484: ; preds = %bb3314
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ret void
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bb5657: ; preds = %bb3314
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%tmp5661 = invoke i16 @_ZNK10wxDateTime12GetDayOfYearERKNS_8TimeZoneE( %struct.wxDateTime* %this, %"struct.wxDateTime::TimeZone"* %tz ) zeroext
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to label %invcont5660 unwind label %lpad ; <i16> [#uses=0]
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invcont5660: ; preds = %bb5657
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ret void
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bb5809: ; preds = %bb3314
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%tmp61.i.i8486 = icmp sgt i64 0, -1 ; <i1> [#uses=1]
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%tmp95.i.i8490 = icmp slt i64 0, 2147483647000 ; <i1> [#uses=1]
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%bothcond9308 = and i1 %tmp61.i.i8486, %tmp95.i.i8490 ; <i1> [#uses=1]
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br i1 %bothcond9308, label %bb91.i8504, label %bb115.critedge.i.i8492
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bb115.critedge.i.i8492: ; preds = %bb5809
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ret void
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bb91.i8504: ; preds = %bb5809
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br i1 false, label %bb155.i8541, label %bb182.i8560
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bb155.i8541: ; preds = %bb91.i8504
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%tmp156.i85398700 = invoke %struct.tm* @gmtime_r( i32* null, %struct.tm* null )
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to label %bb182.i8560 unwind label %lpad ; <%struct.tm*> [#uses=1]
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bb182.i8560: ; preds = %bb155.i8541, %bb91.i8504
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%tm48.0.i8558 = phi %struct.tm* [ null, %bb91.i8504 ], [ %tmp156.i85398700, %bb155.i8541 ] ; <%struct.tm*> [#uses=0]
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br i1 false, label %bb278.i8617, label %bb187.i8591
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bb187.i8591: ; preds = %bb182.i8560
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%tmp245.i8588 = srem i64 0, 86400000 ; <i64> [#uses=1]
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br i1 false, label %bb264.i8592, label %bb265.i8606
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bb264.i8592: ; preds = %bb187.i8591
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ret void
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bb265.i8606: ; preds = %bb187.i8591
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%tmp268269.i8593 = trunc i64 %tmp245.i8588 to i32 ; <i32> [#uses=1]
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%tmp273.i8594 = srem i32 %tmp268269.i8593, 1000 ; <i32> [#uses=1]
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%tmp273274.i8595 = trunc i32 %tmp273.i8594 to i16 ; <i16> [#uses=1]
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br label %invcont5814
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bb278.i8617: ; preds = %bb182.i8560
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%timeOnly50.0.i8622 = add i32 0, 0 ; <i32> [#uses=1]
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br i1 false, label %bb440.i8663, label %bb448.i8694
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bb440.i8663: ; preds = %bb278.i8617
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invoke void @_Z10wxOnAssertPKwiPKcS0_S0_( i32* getelementptr ([27 x i32]* @.str, i32 0, i32 0), i32 1717, i8* getelementptr ([6 x i8]* @_ZZNK10wxDateTime5GetTmERKNS_8TimeZoneEE12__FUNCTION__, i32 0, i32 0), i32* getelementptr ([29 x i32]* @.str33, i32 0, i32 0), i32* getelementptr ([14 x i32]* @.str4, i32 0, i32 0) )
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to label %bb448.i8694 unwind label %lpad
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bb448.i8694: ; preds = %bb440.i8663, %bb278.i8617
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%tmp477.i8669 = srem i32 %timeOnly50.0.i8622, 1000 ; <i32> [#uses=1]
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%tmp477478.i8670 = trunc i32 %tmp477.i8669 to i16 ; <i16> [#uses=1]
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br label %invcont5814
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invcont5814: ; preds = %bb448.i8694, %bb265.i8606
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%tmp812.0.0 = phi i16 [ %tmp477478.i8670, %bb448.i8694 ], [ %tmp273274.i8595, %bb265.i8606 ] ; <i16> [#uses=1]
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%tmp58165817 = zext i16 %tmp812.0.0 to i32 ; <i32> [#uses=1]
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invoke void (%struct.wxString*, i32*, ...)* @_ZN8wxString6FormatEPKwz( %struct.wxString* noalias sret null, i32* null, i32 %tmp58165817 )
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to label %invcont5831 unwind label %lpad
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invcont5831: ; preds = %invcont5814
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%tmp5862 = invoke i8 @_ZN12wxStringBase10ConcatSelfEmPKwm( %struct.wxStringBase* null, i32 0, i32* null, i32 0 ) zeroext
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to label %bb7834 unwind label %lpad8185 ; <i8> [#uses=0]
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bb5968: ; preds = %bb3314
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invoke void (%struct.wxString*, i32*, ...)* @_ZN8wxString6FormatEPKwz( %struct.wxString* noalias sret null, i32* null, i32 0 )
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to label %invcont5981 unwind label %lpad
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invcont5981: ; preds = %bb5968
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ret void
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bb6118: ; preds = %bb3314
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ret void
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bb6406: ; preds = %bb3314
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ret void
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bb6556: ; preds = %bb3314
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ret void
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bb6708: ; preds = %bb3314
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ret void
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bb6860: ; preds = %bb3314
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ret void
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bb7158: ; preds = %bb3314
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ret void
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bb7308: ; preds = %bb3314
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ret void
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bb7595: ; preds = %bb3314
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ret void
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bb7806: ; preds = %bb3314
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%tmp7814 = invoke %struct.wxStringBase* @_ZN12wxStringBase6appendEmw( %struct.wxStringBase* null, i32 1, i32 0 )
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to label %bb7834 unwind label %lpad ; <%struct.wxStringBase*> [#uses=0]
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bb7819: ; preds = %bb3314
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ret void
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bb7834: ; preds = %bb7806, %invcont5831
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br label %bb3261
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lpad: ; preds = %bb7806, %bb5968, %invcont5814, %bb440.i8663, %bb155.i8541, %bb5657, %bb3306
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ret void
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lpad8185: ; preds = %invcont5831
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ret void
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}
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declare void @_Z10wxOnAssertPKwiPKcS0_S0_(i32*, i32, i8*, i32*, i32*)
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declare i8 @_ZN12wxStringBase10ConcatSelfEmPKwm(%struct.wxStringBase*, i32, i32*, i32) zeroext
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declare %struct.tm* @gmtime_r(i32*, %struct.tm*)
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declare i16 @_ZNK10wxDateTime12GetDayOfYearERKNS_8TimeZoneE(%struct.wxDateTime*, %"struct.wxDateTime::TimeZone"*) zeroext
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declare %struct.wxStringBase* @_ZN12wxStringBase6appendEmw(%struct.wxStringBase*, i32, i32)
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declare %struct.wxStringBase* @_ZN12wxStringBaseaSEPKw(%struct.wxStringBase*, i32*)
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declare void @_ZN8wxString6FormatEPKwz(%struct.wxString* noalias sret , i32*, ...)
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