Where previously LLVM might emit code like this:

        ucomisd %xmm1, %xmm0
        setne   %al
        setp    %cl
        orb     %al, %cl
        jne     .LBB4_2

it now emits this:

        ucomisd %xmm1, %xmm0
        jne     .LBB4_2
        jp      .LBB4_2

It has fewer instructions and uses fewer registers, but it does
have more branches. And in the case that this code is followed by
a non-fallthrough edge, it may be followed by a jmp instruction,
resulting in three branch instructions in sequence. Some effort
is made to avoid this situation.

To achieve this, X86ISelLowering.cpp now recognizes FCMP_OEQ and
FCMP_UNE in lowered form, and replace them with code that emits
two branches, except in the case where it would require converting
a fall-through edge to an explicit branch.

Also, X86InstrInfo.cpp's branch analysis and transform code now
knows now to handle blocks with multiple conditional branches. It
uses loops instead of having fixed checks for up to two
instructions. It can now analyze and transform code generated
from FCMP_OEQ and FCMP_UNE.

llvm-svn: 57873

the copy instruction from the instruction list before asking the
target to create the new instruction. This gets the old instruction
out of the way so that it doesn't interfere with the target's
rematerialization code. In the case of x86, this helps it find
more cases where EFLAGS is not live.

Also, in the X86InstrInfo.cpp, teach isSafeToClobberEFLAGS to check
to see if it reached the end of the block after scanning each
instruction, instead of just before. This lets it notice when the
end of the block is only two instructions away, without doing any
additional scanning.

These changes allow rematerialization to clobber EFLAGS in more
cases, for example using xor instead of mov to set the return value
to zero in the included testcase.

llvm-svn: 57872

that NaNs are less common.

llvm-svn: 57871

llvm-svn: 57870

llvm-svn: 57869

llvm-svn: 57864

llvm-svn: 57863

for strange asm conditions earlier.  In this case, we have a
double being passed in an integer reg class.  Convert to like
sized integer register so that we allocate the right number 
for the class (two i32's for the f64 in this case).

llvm-svn: 57862

Further improve path-sensitivity with divide-by-zero checking by assuming that a denominator cannot be zero even when the result of an '/' or '%' expression is unknown.

llvm-svn: 57855

Added test case inspired by <rdar://6268365>: recover path-sensitivity after compound assignment when the result of the assignment is not known.

llvm-svn: 57852

Used conjured symbols to recover path-sensitivity when the result of a compound assignment is UnknownVal().

llvm-svn: 57851

llvm-svn: 57850

llvm-svn: 57847

is re-written by the callback to branch directly to the compiled code
in future invocations.

Added back in range-based memory permission functions for the updating of
the stub on Darwin.

llvm-svn: 57846

llvm-svn: 57845

llvm-svn: 57844

llvm-svn: 57843

Sema::CheckCompareOperands() and ASTContext::mergeTypes(): Change handling of ObjC qualified id types to be consistent with gcc. This changes a handful of test case errors into warnings (diff will tell you which cases have changed).

llvm-svn: 57841

result type when the result type is legal but
not the operand type.  Add additional support
for EXTRACT_SUBVECTOR and CONCAT_VECTORS,
needed to handle such cases.

llvm-svn: 57840

sensible for vectors being scalarized.  Note
that this method can't return anything very
sensible when splitting non-power-of-two vectors.

llvm-svn: 57839

llvm-svn: 57838

with TLI.getPointerTy for a small simplification.

llvm-svn: 57837

the condition of a SELECT node.  Make sure that the
correct extension type (any-, sign- or zero-extend)
is used.

llvm-svn: 57836

llvm-svn: 57834

use an MVT::i1 and simplify the code while there.

llvm-svn: 57833

llvm-svn: 57832

LowerOperation if it doesn't know what else to do.
This methods should probably be factorized some,
but this is good enough for the moment.  Have
LowerATOMIC_BINARY_64 use EXTRACT_ELEMENT rather
than assuming the operand is a BUILD_PAIR (if it
is then getNode will automagically simplify the
EXTRACT_ELEMENT).  This way LowerATOMIC_BINARY_64
usable from LegalizeTypes.

llvm-svn: 57831

llvm-svn: 57829

llvm-svn: 57828

llvm-svn: 57827

llvm-svn: 57820

llvm-svn: 57818

strcmp when needed.

llvm-svn: 57817

llvm-svn: 57816

llvm-svn: 57815

llvm-svn: 57814

llvm-svn: 57813

weird errors about property attributes being unknown.

llvm-svn: 57812

crash.m:8:12: error: type name requires a specifier or qualifier
@property (readonlyx, getter=isAwesome) int _awesome;
           ^
crash.m:8:29: error: expected ';' at end of declaration list
@property (readonlyx, getter=isAwesome) int _awesome;
                            ^
crash.m:8:39: error: expected identifier or '('
@property (readonlyx, getter=isAwesome) int _awesome;
                                      ^

we now get:

crash.m:8:12: error: unknown property attribute 'readonlyx'
@property (readonlyx, getter=isAwesome) int _awesome;
           ^

Also, we can eliminate isObjCPropertyAttribute now.

llvm-svn: 57811

llvm-svn: 57810