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Fix a bug where we were counting the alias sets as completely used 

registers for fast allocation a different way. This has us updating
used registers only when we're using that exact register.

Fixes rdar://9207598

llvm-svn: 129711
This commit is contained in:
Eric Christopher 2011-04-18 19:26:25 +00:00
parent d28977c7c2
commit c37aa0b26a
2 changed files with 15 additions and 5 deletions
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5
llvm/lib/CodeGen/RegAllocFast.cpp
View File

@ -396,7 +396,6 @@ void RAFast::definePhysReg(MachineInstr *MI, unsigned PhysReg,
PhysRegState[PhysReg] = NewState;
for (const unsigned *AS = TRI->getAliasSet(PhysReg);
unsigned Alias = *AS; ++AS) {
UsedInInstr.set(Alias);
switch (unsigned VirtReg = PhysRegState[Alias]) {
case regDisabled:
break;
@ -734,10 +733,6 @@ void RAFast::handleThroughOperands(MachineInstr *MI,
if (!Reg || !TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
DEBUG(dbgs() << "\tSetting reg " << Reg << " as used in instr\n");
UsedInInstr.set(Reg);
for (const unsigned *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
DEBUG(dbgs() << "\tSetting alias reg " << *AS << " as used in instr\n");
UsedInInstr.set(*AS);
}
}
// Also mark PartialDefs as used to avoid reallocation.

15
llvm/test/CodeGen/ARM/2011-04-12-FastRegAlloc.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llc < %s -O0 -verify-machineinstrs -regalloc=fast
; Previously we'd crash as out of registers on this input by clobbering all of
; the aliases.
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
target triple = "thumbv7-apple-darwin10.0.0"
define void @_Z8TestCasev() nounwind ssp {
entry:
%a = alloca float, align 4
%tmp = load float* %a, align 4
call void asm sideeffect "", "w,~{s0},~{s16}"(float %tmp) nounwind, !srcloc !0
ret void
}
!0 = metadata !{i32 109}