llvm-svn: 45830

x86 backend where instructions were not marked maystore/mayload, and perf issues where
instructions were not marked neverHasSideEffects.  It would be really nice if we could
write patterns for copy instructions.

I have audited all the x86 instructions down to MOVDQAmr.  The flags on others and on
other targets are probably not right in all cases, but no clients currently use this
info that are enabled by default.

llvm-svn: 45829

llvm-svn: 45828

llvm-svn: 45827

llvm-svn: 45826

llvm-svn: 45825

inferred from the instr patterns.

llvm-svn: 45824

llvm-svn: 45823

llvm-svn: 45822

llvm-svn: 45821

llvm-svn: 45819

instructions (with patterns) that load memory marked, for example.

llvm-svn: 45818

Also, instructions with any nodes that are SDNPMayLoad also read memory.

llvm-svn: 45817

or being side-effect free.

llvm-svn: 45816

llvm-svn: 45815

llvm-svn: 45814

llvm-svn: 45813

Add a isImmutable bit to StackObject. Fixed stack objects are immutable (in the function) unless specified otherwise.

llvm-svn: 45812

because assembler/linker can't cope with weak absolutes.
PR 1880.

llvm-svn: 45811

MachineRegisterInfo.  Once all clients are switched over, the former will be going away.

llvm-svn: 45805

The first only returns definitions of a register, the second only
returns uses, the third returns both.

llvm-svn: 45803

copies is made.

llvm-svn: 45799

Do not use the stack pointer directly, issue a copyfromreg instead. Otherwise we can end up with something like ADD32ri %esp, x which two-address pass won't like.

llvm-svn: 45798

llvm-svn: 45797

than hardware supported type will be scalarized, so we
can infer their alignment from that info.

We now codegen pr1845 into:

_boolVectorSelect:
	lbz r2, 0(r3)
	stb r2, -16(r1)
	blr 

llvm-svn: 45796

llvm-svn: 45795

llvm-svn: 45792

llvm-svn: 45791

llvm-svn: 45787

Clean up StrongPHIElimination a bit, and add some more comments to the internal structures.  There's
still more work to do on this front.

llvm-svn: 45783

llvm-svn: 45781

llvm-svn: 45780

llvm-svn: 45775

llvm-svn: 45774

llvm-svn: 45773

llvm-svn: 45772

llvm-svn: 45770

llvm-svn: 45768

llvm-svn: 45766

void test(long long *P) { *P ^= 1; }

into just:

_test:
	movl	4(%esp), %eax
	xorl	$1, (%eax)
	ret

instead of code like this:

_test:
	movl	4(%esp), %ecx
        xorl    $1, (%ecx)
	movl	4(%ecx), %edx
	movl	%edx, 4(%ecx)
	ret

llvm-svn: 45762