mirror of
https://gitlab.freedesktop.org/freetype/freetype.git
synced 2026-06-03 17:38:36 +02:00
a5f33eeb8a
When building for ARMv7 with thumb2 instructions, the optimized
`FT_MulFix_arm' assembly routine was not being used.
The reason for this is in the `ftconfig.h' header, namely:
- The assembly routine uses the `smull' instruction which is not
available when generating Thumb-1 machine code. It is available
in Thumb-2 mode, though.
- The header was written a long time ago before Thumb-2 became
widely popular (e.g. with Android). So it simply doesn't use the
assembly routine if the `__thumb__' built-in macro is defined.
- When compiling in Thumb-2 mode, the compiler will define both
`__thumb__' and `__thumb2__'.
By checking for `(__thumb2__ || !__thumb__)', we ensure that the
assembly routine is only avoided when generating Thumb-1 code.
Given that this is performance-sensitive function, this improves
`ftbench' as follows on a Galaxy Nexus:
Before (us/op) After (us/op)
- loading Arial.ttf glyphs at 14 ppem [1]
Load 34.285 33.098
- same operation with the light auto-hinter [2]
Load 31.317 29.590
- same operation without hinting [3]
Load 6.143 5.376
- loading Arial.ttf advances at 14 ppem [4]
Load_Advances (normal) 34.216 33.016
Load_Advances (fast) 0.176 0.176
[1] ftbench -t 5 -p -s 14 -b a -f 0008 Arial.ttf
[2] ftbench -t 5 -p -s 14 -b a -r 1 -f 0028 Arial.ttf
[3] ftbench -t 5 -p -s 14 -b a -f 000a Arial.ttf
[4] ftbench -t 5 -p -s 14 -b b -f 0008 Arial.ttf
* builds/unix/ftconfig.in, include/freetype/config/ftconfig.h
(FT_MULFIX_ASSEMBLER): Fix handling for ARMv7.
|
||
|---|---|---|
| .. | ||
| config | ||
| internal | ||
| freetype.h | ||
| ftadvanc.h | ||
| ftautoh.h | ||
| ftbbox.h | ||
| ftbdf.h | ||
| ftbitmap.h | ||
| ftbzip2.h | ||
| ftcache.h | ||
| ftcffdrv.h | ||
| ftchapters.h | ||
| ftcid.h | ||
| fterrdef.h | ||
| fterrors.h | ||
| ftgasp.h | ||
| ftglyph.h | ||
| ftgxval.h | ||
| ftgzip.h | ||
| ftimage.h | ||
| ftincrem.h | ||
| ftlcdfil.h | ||
| ftlist.h | ||
| ftlzw.h | ||
| ftmac.h | ||
| ftmm.h | ||
| ftmodapi.h | ||
| ftmoderr.h | ||
| ftotval.h | ||
| ftoutln.h | ||
| ftpfr.h | ||
| ftrender.h | ||
| ftsizes.h | ||
| ftsnames.h | ||
| ftstroke.h | ||
| ftsynth.h | ||
| ftsystem.h | ||
| fttrigon.h | ||
| ftttdrv.h | ||
| fttypes.h | ||
| ftwinfnt.h | ||
| ftxf86.h | ||
| t1tables.h | ||
| ttnameid.h | ||
| tttables.h | ||
| tttags.h | ||
| ttunpat.h | ||