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5 commits

Author SHA1 Message Date
Elliott Hughes
ad1658ecfe c32rtomb/mbrtoc32: remove dead code. 
When we added the fast path for the common case of ASCII, we forgot to
remove the now-dead code that handled the 1-byte case later in these
functions. This was obvious from the code coverage data.

Note that the 16-bit variants are unaffected because they're implemented
as calls to the 32-bit variants with extra range checks/surrogate
handling surrounding the call.

Test: treehugger
Change-Id: Ibd40f823519acb9aae8037bdeb3f9c5e36b9d9a6
 2021-12-15 13:41:20 -08:00
Elliott Hughes
2c96639eb2 Optimize the mbs fast path slightly. 
From a logcat profile:
```
     |--95.06%-- convertPrintable(char*, char const*, unsigned long)
     |    |--13.95%-- [hit in function]
     |    |
     |    |--35.96%-- mbrtoc32
     |    |    |--82.72%-- [hit in function]
     |    |    |
     |    |    |--11.07%-- mbsinit
     |    |    |
     |    |    |--5.96%-- @plt
```
I think we'd assumed that mbsinit() would be inlined, but since these
functions aren't all in wchar.cpp it wasn't being. This change moves the
implementation into a (more clearly named) inline function so we can
trivially reclaim that 11%+6%.

Benchmarks before:
```
-------------------------------------------------------------------
Benchmark                         Time             CPU   Iterations
-------------------------------------------------------------------
BM_stdlib_mbrtowc_1            8.03 ns         7.95 ns     87144997
BM_stdlib_mbrtowc_2            22.0 ns         21.8 ns     32002437
BM_stdlib_mbrtowc_3            30.0 ns         29.7 ns     23517699
BM_stdlib_mbrtowc_4            37.4 ns         37.1 ns     18895204
BM_stdlib_mbstowcs_ascii     792373 ns       782484 ns          890 bytes_per_second=609.389M/s
BM_stdlib_mbstowcs_wide    15836785 ns     15678316 ns           44 bytes_per_second=30.4138M/s
```

Benchmarks after:
```
-------------------------------------------------------------------
Benchmark                         Time             CPU   Iterations
-------------------------------------------------------------------
BM_stdlib_mbrtowc_1            5.76 ns         5.72 ns    121863813
BM_stdlib_mbrtowc_2            17.1 ns         16.9 ns     41487260
BM_stdlib_mbrtowc_3            24.2 ns         24.0 ns     29141629
BM_stdlib_mbrtowc_4            30.3 ns         30.1 ns     23229291
BM_stdlib_mbstowcs_ascii     783506 ns       775389 ns          903 bytes_per_second=614.965M/s
BM_stdlib_mbstowcs_wide    12787003 ns     12672642 ns           55 bytes_per_second=37.6273M/s
```

Bug: http://b/206523398
Test: treehugger
Change-Id: If8c6c39880096ddd2cbd323c68dca82e9849ace6
 2021-11-16 11:03:19 -08:00
Yi Kong
32bc0fcf69 Modernize codebase by replacing NULL with nullptr 
Fixes -Wzero-as-null-pointer-constant warning.

Test: m
Bug: 68236239
Change-Id: I5b4123bc6709641315120a191e36cc57541349b2
 2018-08-02 18:09:44 -07:00
Elliott Hughes
697f42afdb Hide various mbstate implementation details. 
...by inlining them.

Also fix a couple of harmless bugs in passing. I've added tests, but in
both cases I don't think it was actually possible to hit the bad behavior:
we'd hit another test and fail immediately after in an externally
indistinguishable way.

Bug: N/A
Test: readelf
Change-Id: I8466050b0bfe2b7b94c76b383cf10c1d9d28debd
 2017-07-14 17:00:05 -07:00
Dan Albert
7a7f9952c1 Adds functionality specified by uchar.h 
mbrtoc32 and c32rtomb get their implementations from mbrtowc and wcrtomb. The
wc functions now simply call the c32 functions.

Bug: 14646575
Change-Id: I49d4b95fed0f9d790260c996c4d0f8bfd1686324
 2014-06-04 08:39:24 -07:00