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Propagate subreg index when promoting a load to a copy.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56085 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-09-11 01:02:12 +00:00
parent 7f85fbd9de
commit d9c553f262
2 changed files with 47 additions and 0 deletions
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7
lib/CodeGen/VirtRegMap.cpp
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@ -1588,11 +1588,18 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
if (DestReg != InReg) {
const TargetRegisterClass *RC = RegInfo->getRegClass(VirtReg);
TII->copyRegToReg(MBB, &MI, DestReg, InReg, RC, RC);
MachineOperand *DefMO = MI.findRegisterDefOperand(DestReg);
unsigned SubIdx = DefMO->getSubReg();
// Revisit the copy so we make sure to notice the effects of the
// operation on the destreg (either needing to RA it if it's
// virtual or needing to clobber any values if it's physical).
NextMII = &MI;
--NextMII; // backtrack to the copy.
// Propagate the sub-register index over.
if (SubIdx) {
DefMO = NextMII->findRegisterDefOperand(DestReg);
DefMO->setSubReg(SubIdx);
}
BackTracked = true;
} else {
DOUT << "Removing now-noop copy: " << MI;

40
test/CodeGen/X86/2008-09-10-SpillerBug2.ll Normal file
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@ -0,0 +1,40 @@
; RUN: llvm-as < %s | llc -march=x86 | grep movw | not grep %e.x
; PR2681
@g_491 = external global i32 ; <i32*> [#uses=1]
@g_897 = external global i16 ; <i16*> [#uses=1]
define i32 @func_7(i16 signext %p_9) nounwind {
entry:
%p_9.addr = alloca i16 ; <i16*> [#uses=2]
%l_1122 = alloca i16, align 2 ; <i16*> [#uses=1]
%l_1128 = alloca i32, align 4 ; <i32*> [#uses=1]
%l_1129 = alloca i32, align 4 ; <i32*> [#uses=1]
%l_1130 = alloca i32, align 4 ; <i32*> [#uses=1]
%tmp14 = load i16* %l_1122 ; <i16> [#uses=1]
%conv15 = sext i16 %tmp14 to i32 ; <i32> [#uses=1]
%tmp16 = load i16* %p_9.addr ; <i16> [#uses=1]
%conv17 = sext i16 %tmp16 to i32 ; <i32> [#uses=1]
%xor = xor i32 %conv15, %conv17 ; <i32> [#uses=1]
%tmp18 = load i32* null ; <i32> [#uses=1]
%or = or i32 %xor, %tmp18 ; <i32> [#uses=1]
%conv19 = trunc i32 %or to i16 ; <i16> [#uses=1]
%tmp28 = load i16* %p_9.addr ; <i16> [#uses=1]
%tmp33 = load i16* @g_897 ; <i16> [#uses=1]
%tmp34 = load i32* @g_491 ; <i32> [#uses=1]
%conv35 = trunc i32 %tmp34 to i16 ; <i16> [#uses=1]
%tmp36 = load i16* null ; <i16> [#uses=1]
%conv37 = trunc i16 %tmp36 to i8 ; <i8> [#uses=1]
%tmp38 = load i32* %l_1128 ; <i32> [#uses=1]
%conv39 = sext i32 %tmp38 to i64 ; <i64> [#uses=1]
%tmp42 = load i32* %l_1129 ; <i32> [#uses=1]
%conv43 = trunc i32 %tmp42 to i16 ; <i16> [#uses=1]
%tmp44 = load i32* %l_1130 ; <i32> [#uses=1]
%conv45 = sext i32 %tmp44 to i64 ; <i64> [#uses=1]
%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]
%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]
%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]
ret i32 undef
}
declare i32 @func_18(i16 zeroext, i16 zeroext, i16 zeroext, i16 zeroext, i8 zeroext, i64, i32, i16 zeroext, i64, i8 zeroext)