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Propagate subreg index when promoting a load to a copy.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56085 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1588,11 +1588,18 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
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if (DestReg != InReg) {
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const TargetRegisterClass *RC = RegInfo->getRegClass(VirtReg);
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TII->copyRegToReg(MBB, &MI, DestReg, InReg, RC, RC);
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MachineOperand *DefMO = MI.findRegisterDefOperand(DestReg);
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unsigned SubIdx = DefMO->getSubReg();
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// Revisit the copy so we make sure to notice the effects of the
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// operation on the destreg (either needing to RA it if it's
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// virtual or needing to clobber any values if it's physical).
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NextMII = &MI;
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--NextMII; // backtrack to the copy.
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// Propagate the sub-register index over.
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if (SubIdx) {
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DefMO = NextMII->findRegisterDefOperand(DestReg);
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DefMO->setSubReg(SubIdx);
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}
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BackTracked = true;
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} else {
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DOUT << "Removing now-noop copy: " << MI;
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40
test/CodeGen/X86/2008-09-10-SpillerBug2.ll
Normal file
40
test/CodeGen/X86/2008-09-10-SpillerBug2.ll
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@ -0,0 +1,40 @@
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; RUN: llvm-as < %s | llc -march=x86 | grep movw | not grep %e.x
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; PR2681
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@g_491 = external global i32 ; <i32*> [#uses=1]
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@g_897 = external global i16 ; <i16*> [#uses=1]
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define i32 @func_7(i16 signext %p_9) nounwind {
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entry:
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%p_9.addr = alloca i16 ; <i16*> [#uses=2]
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%l_1122 = alloca i16, align 2 ; <i16*> [#uses=1]
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%l_1128 = alloca i32, align 4 ; <i32*> [#uses=1]
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%l_1129 = alloca i32, align 4 ; <i32*> [#uses=1]
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%l_1130 = alloca i32, align 4 ; <i32*> [#uses=1]
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%tmp14 = load i16* %l_1122 ; <i16> [#uses=1]
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%conv15 = sext i16 %tmp14 to i32 ; <i32> [#uses=1]
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%tmp16 = load i16* %p_9.addr ; <i16> [#uses=1]
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%conv17 = sext i16 %tmp16 to i32 ; <i32> [#uses=1]
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%xor = xor i32 %conv15, %conv17 ; <i32> [#uses=1]
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%tmp18 = load i32* null ; <i32> [#uses=1]
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%or = or i32 %xor, %tmp18 ; <i32> [#uses=1]
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%conv19 = trunc i32 %or to i16 ; <i16> [#uses=1]
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%tmp28 = load i16* %p_9.addr ; <i16> [#uses=1]
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%tmp33 = load i16* @g_897 ; <i16> [#uses=1]
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%tmp34 = load i32* @g_491 ; <i32> [#uses=1]
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%conv35 = trunc i32 %tmp34 to i16 ; <i16> [#uses=1]
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%tmp36 = load i16* null ; <i16> [#uses=1]
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%conv37 = trunc i16 %tmp36 to i8 ; <i8> [#uses=1]
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%tmp38 = load i32* %l_1128 ; <i32> [#uses=1]
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%conv39 = sext i32 %tmp38 to i64 ; <i64> [#uses=1]
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%tmp42 = load i32* %l_1129 ; <i32> [#uses=1]
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%conv43 = trunc i32 %tmp42 to i16 ; <i16> [#uses=1]
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%tmp44 = load i32* %l_1130 ; <i32> [#uses=1]
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%conv45 = sext i32 %tmp44 to i64 ; <i64> [#uses=1]
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%call46 = call i32 @func_18( i16 zeroext 0, i16 zeroext 0, i16 zeroext %tmp33, i16 zeroext %conv35, i8 zeroext %conv37, i64 %conv39, i32 0, i16 zeroext %conv43, i64 %conv45, i8 zeroext 1 ) ; <i32> [#uses=0]
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%call48 = call i32 @func_18( i16 zeroext 0, i16 zeroext 0, i16 zeroext 0, i16 zeroext 1, i8 zeroext 0, i64 0, i32 1, i16 zeroext %tmp28, i64 0, i8 zeroext 1 ) ; <i32> [#uses=0]
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%call50 = call i32 @func_18( i16 zeroext 1, i16 zeroext 0, i16 zeroext 0, i16 zeroext 1, i8 zeroext 0, i64 0, i32 1, i16 zeroext %conv19, i64 0, i8 zeroext 1 ) ; <i32> [#uses=0]
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ret i32 undef
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}
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declare i32 @func_18(i16 zeroext, i16 zeroext, i16 zeroext, i16 zeroext, i8 zeroext, i64, i32, i16 zeroext, i64, i8 zeroext)
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