[LLVMdev] Emitting .zero

[David Greene]

With LLVM 2.7, I see very inefficient emitting of zeros in .s files:

test_:                                  # @test_
	.quad	0                       # 0x0
	.quad	0                       # 0x0
	.quad	0                       # 0x0
	.quad	0                       # 0x0
	.quad	0                       # 0x0
	.quad	0                       # 0x0
        [...]
	.quad	4                       # 0x4
	.quad	4                       # 0x4
	.quad	4                       # 0x4
	.quad	4                       # 0x4
        [...]

The [...] pieces are huge.  This isn't a zeroinitializer so its not
simply a matter of emitting zeroinitializers more efficiently.

Ideally we'd emit the zeros with a .zero directive.

In this case, doing so is the difference between a 3MB asm file and a
20MB asm file.

I searched the bug database but didn't find anything about this.  Has
anyone looked at improving this?  If not I'll work on it and get a
patch sent up.

But maybe it's fixed in 2.8 or something.

                                   -Dave