On Wed, Jan 10, 2018 at 02:55:07PM +0000, Segher Boessenkool wrote:
> In various of our 32-bit load_toc patterns we take the difference of
> two immediates (labels) as a term to something bigger; but this isn't
> canonical RTL, it needs to be wrapped in CONST.
>
> This fixes it. Tested on powerpc64-linux {-m32,-m64}. Committing.
I backported this (and its followup tweak, adding ilp32 to the new
testcase) to the GCC 7 branch.
Segher
> 2018-01-10 Segher Boessenkool <seg...@kernel.crashing.org>
>
> PR target/83629
> * config/rs6000/rs6000.md (load_toc_v4_PIC_2, load_toc_v4_PIC_3b,
> load_toc_v4_PIC_3c): Wrap const term in CONST RTL.
>
> testsuite/
> PR target/83629
> * gcc.target/powerpc/pr83629.c: New testcase.
