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ad25d4e2df
llvm-6502/lib/CodeGen
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Chris Lattner ad25d4e2df Fix the (zext (zextload)) case to trigger, similarly for sign extends. 
Allow (zext (truncate)) to apply after legalize if the target supports
AND (which all do).

This compiles
short %foo() {
        %tmp.0 = load ubyte* %X         ; <ubyte> [#uses=1]
        %tmp.3 = cast ubyte %tmp.0 to short             ; <short> [#uses=1]
        ret short %tmp.3
}

to:
_foo:
        movzbl _X, %eax
        ret

instead of:

_foo:
        movzbl _X, %eax
        movzbl %al, %eax
        ret

thanks to Evan for pointing this out.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24709 91177308-0d34-0410-b5e6-96231b3b80d8
2005-12-14 19:05:06 +00:00
..
SelectionDAG Fix the (zext (zextload)) case to trigger, similarly for sign extends. 2005-12-14 19:05:06 +00:00
AsmPrinter.cpp Add a couple more fields, move ctor init list to .cpp file, add support 2005-12-13 06:32:10 +00:00
BranchFolding.cpp
ELFWriter.cpp nuke blank line 2005-11-10 18:49:46 +00:00
IntrinsicLowering.cpp continued readcyclecounter support 2005-11-11 16:47:30 +00:00
LiveInterval.cpp Fix LiveInterval::getOverlapingRanges to take things in the right order 2005-10-21 06:41:30 +00:00
LiveIntervalAnalysis.cpp Fix some spello's pointed out by Gabor Greif 2005-10-26 18:41:41 +00:00
LiveVariables.cpp Add section switching to common code generator code. Add a couple of 2005-11-21 07:06:27 +00:00
MachineBasicBlock.cpp
MachineCodeEmitter.cpp new is not a valid default anywhere, so make this pure virtual 2005-07-28 18:13:59 +00:00
MachineFunction.cpp Added graphviz/gv support for MF. 2005-10-12 12:09:05 +00:00
MachineInstr.cpp
Makefile
Passes.cpp Alkis agrees that that iterative scan allocator isn't going to be worked on 2005-10-24 04:14:30 +00:00
PHIElimination.cpp clean up this code a bit, no functionality change 2005-10-03 07:22:07 +00:00
PhysRegTracker.h
PrologEpilogInserter.cpp Always compute max align. 2005-11-06 17:43:20 +00:00
RegAllocLinearScan.cpp I think I know what you meant here, but just to be safe I'll let you 2005-11-21 14:09:40 +00:00
RegAllocLocal.cpp Nuke noop copies. 2005-11-09 18:22:42 +00:00
RegAllocSimple.cpp Change this code ot pass register classes into the stack slot spiller/reloader 2005-09-30 01:29:00 +00:00
TwoAddressInstructionPass.cpp Fix some spello's pointed out by Gabor Greif 2005-10-26 18:41:41 +00:00
UnreachableBlockElim.cpp
VirtRegMap.cpp Fix the LLC regressions on X86 last night. In particular, when undoing 2005-10-06 17:19:06 +00:00
VirtRegMap.h