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tcg/arm: add bswap ops

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Add an bswap16 and bswap32 ops, either using the rev and rev16
instructions on ARMv6+ or shifts and logical operations on previous
ARM versions. In both cases the result use less instructions than
the pure TCG version.

These ops are also needed by the qemu_ld/st functions.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-04-09 20:52:48 +02:00
parent 9517094f72
commit 244b1e81f6
2 changed files with 44 additions and 2 deletions
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4
tcg/arm/tcg-target.h
View file

@ -62,8 +62,8 @@ enum {
#define TCG_TARGET_HAS_ext16s_i32
#undef TCG_TARGET_HAS_ext8u_i32 /* and r0, r1, #0xff */
#define TCG_TARGET_HAS_ext16u_i32
// #define TCG_TARGET_HAS_bswap16_i32
// #define TCG_TARGET_HAS_bswap32_i32
#define TCG_TARGET_HAS_bswap16_i32
#define TCG_TARGET_HAS_bswap32_i32
#define TCG_TARGET_HAS_not_i32
#define TCG_TARGET_HAS_neg_i32
#define TCG_TARGET_HAS_rot_i32