https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
Andrew Pinski changed:
What|Removed |Added
Ever confirmed|0 |1
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
Andrew Pinski changed:
What|Removed |Added
Severity|normal |enhancement
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
--- Comment #5 from Iain Buclaw ---
(In reply to Uroš Bizjak from comment #4)
> from:
> movl%esi, %ecx
> movl$1, %eax
> sall%cl, %eax
> testl %edi, %eax
> setne %al
> movzbl %al,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
--- Comment #4 from Uroš Bizjak ---
Created attachment 53901
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53901=edit
Patch that adds relevant zero_extract patterns
This patch adds relevant zero_extract patterns that optimize:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
--- Comment #3 from Hongtao.liu ---
We already have
--cut from i386.md
15204;; Help combine recognize bt followed by setc
15205(define_insn_and_split "*bt_setcqi"
15206 [(set (subreg:SWI48 (match_operand:QI 0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
--- Comment #2 from Iain Buclaw ---
Expected generated code would be:
---
bt32_setb*:
...
shrl$5, %edx
movl(%eax,%edx,4), %edx
xorl%eax, %eax
btl %ecx, %edx
setb%al
...
---
bt32_setae*:
...
shrl$5, %edx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107671
--- Comment #1 from Iain Buclaw ---
Non-pointer variants also not detected.
---
int bt32v_setb(const __UINT32_TYPE__ v, __UINT32_TYPE__ bitnum)
{
return ((v & (1 << (bitnum & 31 != 0;
}
int bt64v_setb(const __UINT64_TYPE__ v,
