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target-mips: implement unaligned loads using TCG

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Load/store from helpers should be avoided as they are quite
inefficient. Rewrite unaligned loads instructions using TCG and
aligned loads. The number of actual loads operations to implement
an unaligned load instruction is reduced from up to 8 to 1.

Note: As we can't rely on shift by 32 or 64 undefined behaviour,
the code loads already shift by one constants.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-10-09 21:53:21 +02:00
parent 18bba4dc78
commit fc40787abc
3 changed files with 62 additions and 159 deletions
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4
target-mips/helper.h
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@ -4,13 +4,9 @@ DEF_HELPER_3(raise_exception_err, noreturn, env, i32, int)
DEF_HELPER_2(raise_exception, noreturn, env, i32)
#ifdef TARGET_MIPS64
DEF_HELPER_4(ldl, tl, env, tl, tl, int)
DEF_HELPER_4(ldr, tl, env, tl, tl, int)
DEF_HELPER_4(sdl, void, env, tl, tl, int)
DEF_HELPER_4(sdr, void, env, tl, tl, int)
#endif
DEF_HELPER_4(lwl, tl, env, tl, tl, int)
DEF_HELPER_4(lwr, tl, env, tl, tl, int)
DEF_HELPER_4(swl, void, env, tl, tl, int)
DEF_HELPER_4(swr, void, env, tl, tl, int)