[Bug tree-optimization/106420] Missed optimization for comparisons

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106420 --- Comment #4 from zero at smallinteger dot com --- Sorry about that :/.

[Bug target/106420] Missed optimization for comparisons

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106420 --- Comment #1 from zero at smallinteger dot com --- (it should be possible to massage the output further to use test and setne, which ICC prefers to e.g. cmp and seta)

[Bug target/106420] New: Missed optimization for comparisons

Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 53339 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53339&action=edit Sample code When comparing different variables to the same constants, in som

[Bug target/105778] New: Rotate by register --- unnecessary AND instruction

Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 53053 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53053&action=edit Sample code With -O2, some x86 shift-by-register instructi

[Bug target/100391] New: 128 bit arithmetic --- many unnecessary instructions when extracting smaller parts

Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 50738 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50738&action=edit Samp

[Bug target/100331] New: 128 bit arithmetic --- suboptimal after shifting when referencing other variables

Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 50706 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50706&action=edit Reproducti

[Bug target/95861] New: popcnt --- unnecessary leading xor instruction

: target Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 48778 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48778&action=edit sample code Consider the attached code, compiled with -O3 -mpopcn

[Bug target/95834] New: x86 immediates --- some redundant

Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 48774 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48774&action=edit sample code In some cases, literals could be synthesized with simple instr

[Bug target/95798] Initialization code --- suboptimal

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95798 --- Comment #1 from zero at smallinteger dot com --- (note that changing the array declaration to be initialized does not result in the individual array writes being optimized away, as one might expect at first glance)

[Bug target/95798] New: Initialization code --- suboptimal

Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 48764 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48764&action=edit sample code This is similar to (but not the same as) bug 87223 for structs.

[Bug target/95566] New: x86 instruction selection --- some REX prefixes unnecessary

Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zero at smallinteger dot com Target Milestone: --- Created attachment 48696 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48696&action=edit sample code Consider the code a