with a general target hook to identify rematerializable instructions. Some
instructions are only rematerializable with specific operands, such as loads
from constant pools, while others are always rematerializable. This hook
allows both to be identified as being rematerializable with the same
mechanism.

llvm-svn: 37644

Anton for half of this patch.

llvm-svn: 37641

Look for VECTOR_SHUFFLE that's identity operation on either LHS or RHS. This can happen before DAGCombiner catches it.

llvm-svn: 37636

llvm-svn: 37625

define double @test2(i64 %A) {
   %B = bitcast i64 %A to double
   ret double %B
}

$ llvm-as < t.ll | llc -march=x86-64

before:

         .align  4
         .globl  _test2
_test2:
         movd %rdi, %xmm0
         ret

after:

_test2:
         subq $8, %rsp
         movq %rdi, (%rsp)
         movsd (%rsp), %xmm0
         addq $8, %rsp
         ret

llvm-svn: 37617

llvm-svn: 37611

llvm-svn: 37579

llvm-svn: 37578

implementation for x86.

llvm-svn: 37576

llvm-svn: 37574

llvm-svn: 37571

llvm-svn: 37534

llvm-svn: 37533

llvm-svn: 37528

llvm-svn: 37419

llvm-svn: 37320

llvm-svn: 37275

llvm-svn: 37266

llvm-svn: 37239

llvm-svn: 37234

llvm-svn: 37193

Fix a bogus check that prevented folding VECTOR_SHUFFLE to UNDEF; add an optimization to fold VECTOR_SHUFFLE to a zero vector.

llvm-svn: 37173

llvm-svn: 37172

cause other regressions.

llvm-svn: 37160

llvm-svn: 37159

llvm-svn: 37154

llvm-svn: 37141

llvm-svn: 37100

llvm-svn: 37065

1. Fix PR1380
2. Apply Duncan's patch from PR1410
3. Insert workaround for "one personality function per module" as noted in PR1414
4. Emit correct debug frames for x86/linux. This partly fixes DebugInfo/2006-11-06-StackTrace.cpp: stack trace is
shown correctly, but arguments for function on top of stack are displayed incorrectly.

llvm-svn: 37015

llvm-svn: 36965

llvm-svn: 36860

llvm-svn: 36834

llvm-svn: 36799

some small cleanup was made.

llvm-svn: 36780

feature is set, then the features in the implied list should be set also.
The opposite is also enforced: if a feature in the implied list isn't set,
then the feature that owns that implies list shouldn't be set either.

llvm-svn: 36756

  1. x86 backend rejected (&gv+c) for the 'i' constraint when in static mode.
  2. the matcher didn't correctly reject and accept some global addresses.
     the right predicate is GVRequiresExtraLoad, not "relomodel = pic".

llvm-svn: 36670

flag for ELF on x86 so that duplicate constants can be eliminated by
the linker. This matches what GCC does with its -fmerge-constants
option, which is enabled at most -O levels.

llvm-svn: 36666

llvm-svn: 36662

for SSE1, SSE2, SSE3, and SSSE3.

llvm-svn: 36656