On Fri, May 8, 2015 at 9:38 AM, Segher Boessenkool <seg...@kernel.crashing.org> wrote: > This peephole transforms > > lis a,HI ; ori a,a,LO > cmpw c,a,b ; beq c,... > > to > > xoris a,b,HI1 > cmpwi c,a,LO1 ; beq c,... > > when a and c are dead after this. But it forgets to check that a and b > are not the same reg, generating non-sensical code. This patch fixes that. > > Tested etc.; is this okay for trunk? > > (This peephole caused some FAILs in the testsuite after an unrelated change; > gone after this patch). > > > Segher > > > 2015-05-08 Segher Boessenkool <seg...@kernel.crashing.org> > > * config/rs6000/rs6000.md: Require operand inequality in one > of the peepholes.
Okay. Is there an artificial testcase? Thanks, David
