[patch] Shark reroute LLVM atomic intrinsics to Zero

[Robert Schuster]

Hi Xerxes, Andrew, Gary,

Xerxes Rånby schrieb:
>> The 'bug' is actually a missing feature and I don't see someone working
>> on this. I tried fixing it myself but it will take me a while until
>> understand how to use llvm's tablegen syntax to describe the generation
>> of a series of instructions for the compiler
> Found this great google-find: http://markmail.org/message/73owc5nrvsbmrhes
> It is the mail correspondence when Gary implemented the atomic
> intrinsics in llvm for PPC.
> Great work Gary!
very cool. With this correspondence I can understand the approach taken
for PPC much easier. While it has been modified since Gary implemented
it, there is still the approach with the pseudo instruction.

For the first time I got llc to properly decode the cmp_swap intrinsic.
The generated code below is nothing but working but the result is more
than what I had last week:

	.text
	.globl	test_compare_and_swap
	.align	2
test_compare_and_swap:
	sub sp, sp, #4
	str lr, [sp]
	mov r0, #4
	bl malloc
	mov r3, #200
	mov r2, #100
	@ ATOMIC_CMP_SWAP_I32 PSEUDO!
.LBB1_1:	@ return
	ldr lr, [sp]
	add sp, sp, #4
	bx lr
	.size test_compare_and_swap, .-test_compare_and_swap


Regards
Robert

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