[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #1 from shihua at iscas dot ac.cn --- This patch is https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c23a9c87cc62bd177fd0d4db6ad34b34e1b9a31f

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 Andrew Pinski changed: What|Removed |Added CC||vineetg at gcc dot gnu.org --- Comment

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #3 from Vineet Gupta --- Debugging of ctz3 case The insns of interest are: insn_cost 4 for 6: r74:SI=ctz(r73:DI#0) REG_DEAD r73:DI insn_cost 4 for 7: r72:DI=sign_extend(r74:SI) REG_DEAD r74:SI Before the commit

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #4 from Jeffrey A. Law --- Vineet, we've got some bits here you might want to play with. I'm about to leave for the evening, but I'll put you in touch with Raphael tomorrow afternoon.

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #5 from Roger Sayle --- Created attachment 54905 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54905&action=edit proposed patch This patch should fix this problem, by adding another pattern the machine description to also rec

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #6 from Jeffrey A. Law --- Comment on attachment 54905 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54905 proposed patch So that's a subset of what we've done. We initially thought that was going to be enough to solve this

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #7 from Vineet Gupta --- (In reply to Roger Sayle from comment #5) > Created attachment 54905 [details] > proposed patch > > This patch should fix this problem, by adding another pattern the machine > description to also recognize z

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #8 from Jeffrey A. Law --- So coming back to this after a couple months, I'm confident the match.pd change is unnecessary and in fact wrong. So we definitely want to set that aside.

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #9 from Vineet Gupta --- (In reply to Jeffrey A. Law from comment #6) > Comment on attachment 54905 [details] > proposed patch > > So that's a subset of what we've done. We initially thought that was going > to be enough to solve t

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #10 from Jeffrey A. Law --- The sign_extend later gets turned into zero_extend. Presumably because we know the value is never negative. That in and of itself wouldn't be a big deal as it should be easily recognizable using any_exte

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 --- Comment #11 from CVS Commits --- The master branch has been updated by Jeff Law : https://gcc.gnu.org/g:9000da00dd70988f30d43806bae33b22ee6b9904 commit r14-1006-g9000da00dd70988f30d43806bae33b22ee6b9904 Author: Raphael Moreira Zinsly Date

[Bug tree-optimization/106888] [RISCV] Negative optimization that excess andi instructions are generated in gcc.dg/pr90838.c

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106888 Jeffrey A. Law changed: What|Removed |Added Resolution|--- |FIXED Status|UNCONFIRMED