llvm-svn: 48055

llvm-svn: 48054

Implement x86 support for @llvm.prefetch. It corresponds to prefetcht{0|1|2} and prefetchnta instructions.

llvm-svn: 48042

we're using SSE or not.  This fixes PR2122.

llvm-svn: 48006

llvm-svn: 47996

llvm-svn: 47948

llvm-svn: 47941

llvm-svn: 47940

llvm-svn: 47939

llvm-svn: 47934

llvm-svn: 47933

For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive.

llvm-svn: 47931

llvm-svn: 47929

findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.

llvm-svn: 47927

llvm-svn: 47903

llvm-svn: 47878

llvm-svn: 47871

llvm-svn: 47865

llvm-svn: 47857

llvm-svn: 47828

llvm-svn: 47800

llvm-svn: 47799

llvm-svn: 47798

Add lock prefix support to x86.  Also add the instructions necessary for the atomic ops.  They are still marked pseudo, since I cannot figure out what format to use, but they are the correct opcode.

llvm-svn: 47795

llvm-svn: 47770

llvm-svn: 47740

llvm-svn: 47736

llvm-svn: 47711

llvm-svn: 47704

llvm-svn: 47703

llvm-svn: 47702

provide TAI hook for selection of EH data emission format. Currently unused.

llvm-svn: 47699

llvm-svn: 47688

stack slot and store if the  SINT_TO_FP is actually legal.  This allows
us to compile:

double a(double b) {return (unsigned)b;}

to:

_a:
	cvttsd2siq	%xmm0, %rax
	movl	%eax, %eax
	cvtsi2sdq	%rax, %xmm0
	ret

instead of:

_a:
	subq	$8, %rsp
	cvttsd2siq	%xmm0, %rax
	movl	%eax, %eax
	cvtsi2sdq	%rax, %xmm0
	addq	$8, %rsp
	ret

crazy.

llvm-svn: 47660

llvm-svn: 47659

_test:
	movl	%edi, %eax
	ret

instead of:

_test:
        movl    $4294967295, %ecx
        movq    %rdi, %rax
        andq    %rcx, %rax
        ret

It would be great to write this as a Pat pattern that used subregs 
instead of a 'pseudo' instruction, but I don't know how to do that
in td files.

llvm-svn: 47658

llvm-svn: 47652

llvm-svn: 47635

would have been a Godsend here!

llvm-svn: 47625

llvm-svn: 47606