computation. A def of a register doesn't necessarily kill
live super-registers.

llvm-svn: 57614

an unindexed load.

llvm-svn: 57612

to find opportunities for store-to-load forwarding or load CSE,
in the same way that visitStore scans back to do DSE. Also, define
a new helper function for testing whether the addresses of two
memory accesses are known to have the same value, and use it in
both visitStore and visitLoad.

These two changes allow instcombine to eliminate loads in code
produced by front-ends that frequently emit obviously redundant
addressing for memory references.

llvm-svn: 57608

llvm-svn: 57606

llvm-svn: 57595

llvm-svn: 57594

This fixes PR2894.

llvm-svn: 57589

llvm-svn: 57586

llvm-svn: 57582

llvm-svn: 57579

llvm-svn: 57577

llvm-svn: 57576

llvm-svn: 57575

llvm-svn: 57574

llvm-svn: 57573

llvm-svn: 57572

the predicates by extending simple predicates to create
more complex predicates instead of duplicating the logic
for the simple predicates.

This doesn't reduce much redundancy in DAGISelEmitter.cpp's
generated source yet; that will require improvements to
DAGISelEmitter.cpp's instruction sorting, to make it more
effectively group nodes with similar predicates together.

llvm-svn: 57565

llvm-svn: 57561

integer type.  Invalid things like 'float 42' are now rejected by the
semantic analysis in the productions not the parser.  This fixes PR2733.

llvm-svn: 57560

llvm-svn: 57559

INTTYPE everywhere.

llvm-svn: 57558

llvm-svn: 57557

are due to argument passing in calls.  This is significant because
it hits all immediate arguments to calls on x86-32.

llvm-svn: 57556

this:

-	movl	$0, %eax
-	movl	%eax, _yy_n_chars
+	movl	$0, _yy_n_chars

llvm-svn: 57555

llvm-svn: 57553

1. Compute action in X86SelectSelect based on MVT instead of type.
2. Use TLI.getValueType(..) instead of MVT::getVT(..) because the former
   handles pointers and the later doesn't.
3. Don't pass TLI into isTypeLegal, since it already has access to it as 
   an ivar.

#2 gives fast isel some minor new functionality: handling load/stores of
pointers.

llvm-svn: 57552

llvm-svn: 57551

change the generated code, but makes the code simpler.

llvm-svn: 57550

which makes it easy to share the compare/imm folding logic with 'setcc'.
This shaves a bunch of instructions off the common select case, which
happens a lot in llvm-gcc.

llvm-svn: 57549

loading 4 into a register and then doing the compare.

llvm-svn: 57548

llvm-svn: 57547

llvm-svn: 57546

llvm-svn: 57545

llvm-svn: 57544

with other debug messages.

llvm-svn: 57543

i.e. conditions that cannot be checked with a single instruction. For example,
SETONE and SETUEQ on x86.
- Teach legalizer to implement *illegal* setcc as a and / or of a number of
legal setcc nodes. For now, only implement FP conditions. e.g. SETONE is
implemented as SETO & SETNE, SETUEQ is SETUO | SETEQ.
- Move x86 target over.

llvm-svn: 57542

 - Move the EH landing-pad code and adjust it so that it works
   with FastISel as well as with SDISel.
 - Add FastISel support for @llvm.eh.exception and
   @llvm.eh.selector.

llvm-svn: 57539

Update LangRef to mention \xx quoting in names.

llvm-svn: 57538

 - Avoids duplicated quotification code.
 - Remove QuoteNameIfNeeded.
 - No functionality change.

llvm-svn: 57537

for pentium).  Fixes
gcc.target/i386/20000720-1.c
gcc.target/i386/pr26826.c

llvm-svn: 57528