[llvm-commits] [PATCH]: disable ADDIC/imm32 optimizations on PPC64

[Roman Divacky]

Hi there!

In the PowerPC backend there's an DAG optimization for 
imm32=={0,-1} etc. using ADDIC instruction. This uses
the fact that ADDIC sets the carry bit on overlow.

This of course does not work on PPC64 because registers
there are 64bit so no overflow happens with 32bit immediate.

The attached patch disables these optimizations on PPC64.
With this patch I am able to compile a running "vim" at -O2.

OK to commit?

roman
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