SSE2 and SSE4_1 use flags
| Project: | Linux software |
| Component: | Documentation |
| Category: | support request |
| Priority: | normal |
| Assigned: | Unassigned |
| Status: | active |
| Related pages: | #36: CPU - Central Processing Unit :-:-: #10896: Portage USE flags |
| Tags: | CPU, libwebp, SSE, USE flag |
Description
I have an update today with changed use flags:
[ebuild R ] media-libs/libwebp-0.5.2 USE="(-neon)" CPU_FLAGS_X86="sse2%* -avx2% -sse4_1%" cpu_flags_x86_sse2 was previously enabled but is getting disabled:
# equery u libwebp
[ Legend : U - final flag setting for installation]
[ : I - package is installed with flag ]
[ Colors : set, unset ]
* Found these USE flags for media-libs/libwebp-0.5.2:
U I
- - abi_x86_32 : 32-bit (x86) libraries
- - cpu_flags_x86_avx2 : Adds support for Advanced Vector Extensions 2 instructions
+ - cpu_flags_x86_sse2 : Use the SSE2 instruction set
- - cpu_flags_x86_sse4_1 : Enable SSE4.1 instruction support
- - experimental : Build with -DWEBP_EXPERIMENTAL_FEATURES
+ + gif : Add GIF image support
+ + jpeg : Add JPEG image support
+ + opengl : Add support for OpenGL (3D graphics)
+ + png : Add support for libpng (PNG images)
- - static-libs : Build static versions of dynamic libraries as well
- - swap-16bit-csp : Enable byte swapping for 16 bit colorspace
+ + tiff : Add support for the TIFF image format my CPU has both:
cat /proc/cpuinfo
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save vmmcallShould I enable them?