https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78437
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Eric Botcazou from comment #3) > Created attachment 40098 [details] > Tentative fix > > It only affects Alpha (by default) but I no longer have access to Alpha > hardware so I'm going to play with it on SPARC. Its effect on the assembly > code on Alpha is: > > --- pr78437_1.s 2016-11-21 11:54:33.678363106 +0100 > +++ pr78437_2.s 2016-11-21 11:54:40.230542615 +0100 > @@ -62,7 +62,7 @@ > ldbu $7,max($5) !gprellow > sextb $8,$3 > stb $8,expected($2) !gprellow > - mov $3,$22 > + bis $31,$8,$22 > sextb $7,$7 > cmpeq $3,$7,$3 > beq $3,$L4 > > FWIW the change for PR rtl-opt/59461 eliminated 2 redundant extensions. Yes this change fixes reduced testcase execution. I have started bootstrap+regtest with your patch on alpha native. Please expect results sometime tomorrow.
