llvm-6502/include/llvm/Target
Chris Lattner 5a09690446 Implement a signficant optimization for inline asm:
When choosing between constraints with multiple options,
like "ir", test to see if we can use the 'i' constraint and
go with that if possible.  This produces more optimal ASM in
all cases (sparing a register and an instruction to load it),
and fixes inline asm like this:

void test () {
  asm volatile (" %c0 %1 " : : "imr" (42), "imr"(14));
}

Previously we would dump "42" into a memory location (which
is ok for the 'm' constraint) which would cause a problem
because the 'c' modifier is not valid on memory operands.

Isn't it great how inline asm turns 'missed optimization'
into 'compile failed'??

Incidentally, this was the todo in 
PowerPC/2007-04-24-InlineAsm-I-Modifier.ll

Please do NOT pull this into Tak.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50315 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-27 00:37:18 +00:00
..
SubtargetFeature.h
TargetAsmInfo.h
TargetData.h
TargetELFWriterInfo.h
TargetFrameInfo.h
TargetInstrDesc.h
TargetInstrInfo.h
TargetInstrItineraries.h
TargetJITInfo.h Correlate stubs with functions in JIT: when emitting a stub, the JIT tells the memory manager which function 2008-04-16 20:46:05 +00:00
TargetLowering.h Implement a signficant optimization for inline asm: 2008-04-27 00:37:18 +00:00
TargetMachine.h Add facility for pre-RA passes 2008-04-23 18:22:28 +00:00
TargetMachineRegistry.h
TargetMachOWriterInfo.h
TargetOptions.h Make stack alignment options global for all targets 2008-04-23 18:18:10 +00:00
TargetRegisterInfo.h
TargetSubtarget.h