llvm-svn: 130995

Patch by Wei-Ren Chen

llvm-svn: 130980

return the pointer being dereferenced, it returns the pointee, but a call
might return the pointer itself.

llvm-svn: 130979

possibly related to cbnz formation.

llvm-svn: 130977

PR9838: Fix transform introduced in r127064 to not trigger when only one side of the icmp is an exact shift.

llvm-svn: 130954

I tested both gdb on a bootstrapped clang and and the gdb testsuite on OS X (snow leopard)
and both are happy using __eh_frame.

llvm-svn: 130937

Many LLVM tests relies on standard output stream be in the binary mode. Which is not always the case (on Windows in particular). The patch adds a test to verify that the standard output stream is actually in the binary mode.

llvm-svn: 130936

Avoid extra vreg copies for arguments passed in registers.  Specifically, this can make MachineCSE more effective in some cases (especially in small functions).  PR8361 / part of rdar://problem/8259436 .

llvm-svn: 130928

This should unbreak llvm-gcc-i386-linux-selfhost.

llvm-svn: 130927

llvm-svn: 130893

Most of these tests require a single mov instruction that can come either before
or after a 2-addr instruction. -join-physregs changes the behavior, but the
results are equivalent.

llvm-svn: 130891

the default register allocator is changed.

llvm-svn: 130883

landing pad as its successor.

SjLj exception handling jumps to the correct landing pad via a switch statement
that's generated right before code-gen. Loosen the constraint in the machine
instruction verifier to allow for this. Note, this isn't the most rigorous check
since we cannot determine where that switch statement came from. But it's
marginally better than turning this check off when SjLj exceptions are used.
<rdar://problem/9187612>

llvm-svn: 130881

Original message:

Teach MachineCSE how to do simple cross-block CSE involving physregs.  This allows, for example, eliminating duplicate cmpl's on x86. Part of rdar://problem/8259436 .

llvm-svn: 130877

This test fails on ARM. The test shouldn't explicitly specify alignment (and alignment 4 is wrong) and requires hard-float.

llvm-svn: 130875

llvm-svn: 130867

Teach MachineCSE how to do simple cross-block CSE involving physregs.  This allows, for example, eliminating duplicate cmpl's on x86. Part of rdar://problem/8259436 .

llvm-svn: 130862

llvm-svn: 130859

These tests all follow the same pattern:

	mov	r2, r0
	movs	r0, #0
	$CMP	r2, r1
	it	eq
	moveq	r0, #1
	bx	lr

The first 'mov' can be eliminated by rematerializing 'movs r0, #0' below the
test instruction:

	$CMP	r0, r1
	mov.w	r0, #0
	it	eq
	moveq	r0, #1
	bx	lr

So far, only physreg coalescing can do that. The register allocators won't yet
split live ranges just to eliminate copies. They can learn, but this particular
problem is not likely to show up in real code. It only appears because r0 is
used for both the function argument and return value.

llvm-svn: 130858

llvm-svn: 130856

llvm-svn: 130855

llvm-svn: 130854

llvm-svn: 130849

Prevent instructions using $gp from being placed between a jalr and the instruction that restores the clobbered $gp.

llvm-svn: 130847

it is both inefficient and unexpected by dwarfdump. Change to
a DW_FORM_data4.

While in here, change the predicate name to reflect that the position
is not really absolute (it is an offset), just that the linker needs a
relocation.

llvm-svn: 130846

but according to my super-optimizer there are only two missed simplifications
of -instsimplify kind when compiling bzip2, and this is one of them.  It amuses
me to have bzip2 be perfectly optimized as far as instsimplify goes!

llvm-svn: 130840

llvm-svn: 130818

The basic allocator is really bad about hinting, so it doesn't eliminate all
copies when physreg joining is disabled.

llvm-svn: 130817

llvm-svn: 130816

llvm-svn: 130815

llvm-svn: 130812

llvm-svn: 130800

<rdar://problem/8460511>

llvm-svn: 130791

max(a,b) >= a -> true.  According to my super-optimizer, these are
by far the most common simplifications (of the -instsimplify kind)
that occur in the testsuite and aren't caught by -std-compile-opts.

llvm-svn: 130780

llvm-svn: 130778

llvm-svn: 130769

llvm-svn: 130763

llvm-svn: 130754

string template.

Fixes rdar://8493866

llvm-svn: 130747

model constants which can be added to base registers via add-immediate
instructions which don't require an additional register to materialize
the immediate.

llvm-svn: 130743