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Make linear scan's trivial coalescer slightly more aggressive.

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llvm-svn: 62547
This commit is contained in:
Evan Cheng 2009-01-20 00:16:18 +00:00
parent 5281f4fb64
commit 5ee5ba12be
2 changed files with 14 additions and 6 deletions
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12
lib/CodeGen/RegAllocLinearScan.cpp
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@ -249,7 +249,7 @@ unsigned RALinScan::attemptTrivialCoalescing(LiveInterval &cur, unsigned Reg) {
if ((cur.preference && cur.preference == Reg) || !cur.containsOneValue())
return Reg;
VNInfo *vni = cur.getValNumInfo(0);
VNInfo *vni = cur.begin()->valno;
if (!vni->def || vni->def == ~1U || vni->def == ~0U)
return Reg;
MachineInstr *CopyMI = li_->getInstructionFromIndex(vni->def);
@ -686,13 +686,13 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
unsigned StartPosition = cur->beginNumber();
const TargetRegisterClass *RCLeader = RelatedRegClasses.getLeaderValue(RC);
// If this live interval is defined by a move instruction and its source is
// assigned a physical register that is compatible with the target register
// class, then we should try to assign it the same register.
// If start of this live interval is defined by a move instruction and its
// source is assigned a physical register that is compatible with the target
// register class, then we should try to assign it the same register.
// This can happen when the move is from a larger register class to a smaller
// one, e.g. X86::mov32to32_. These move instructions are not coalescable.
if (!cur->preference && cur->containsOneValue()) {
VNInfo *vni = cur->getValNumInfo(0);
if (!cur->preference && cur->hasAtLeastOneValue()) {
VNInfo *vni = cur->begin()->valno;
if (vni->def && vni->def != ~1U && vni->def != ~0U) {
MachineInstr *CopyMI = li_->getInstructionFromIndex(vni->def);
unsigned SrcReg, DstReg;

8
test/CodeGen/X86/uint_to_fp-2.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 | grep movsd | count 1
; rdar://6504833
define float @f(i32 %x) nounwind readnone {
entry:
%0 = uitofp i32 %x to float
ret float %0
}