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| author | Aurelien Jarno <aurelien@aurel32.net> | 2010-04-09 20:52:48 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-04-19 07:03:02 +0200 |
| commit | 244b1e81f6afc2ddc866a6dbad42ccafd10c246b (patch) | |
| tree | 994da373128d5911745ab0d08a83398f12dc094f /tcg/arm | |
| parent | 9517094f720097b51854ef458ffb1971720dddfa (diff) | |
| download | qemu-244b1e81f6afc2ddc866a6dbad42ccafd10c246b.tar.gz | |
tcg/arm: add bswap ops
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>
Diffstat (limited to 'tcg/arm')
| -rw-r--r-- | tcg/arm/tcg-target.c | 42 | ||||
| -rw-r--r-- | tcg/arm/tcg-target.h | 4 |
2 files changed, 44 insertions, 2 deletions
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c index efcefe2c90..5bef30666c 100644 --- a/tcg/arm/tcg-target.c +++ b/tcg/arm/tcg-target.c @@ -527,6 +527,38 @@ static inline void tcg_out_ext16u(TCGContext *s, int cond, } } +static inline void tcg_out_bswap16(TCGContext *s, int cond, int rd, int rn) +{ + if (use_armv6_instructions) { + /* rev16 */ + tcg_out32(s, 0x06bf0fb0 | (cond << 28) | (rd << 12) | rn); + } else { + tcg_out_dat_reg(s, cond, ARITH_MOV, + TCG_REG_R8, 0, rn, SHIFT_IMM_LSL(24)); + tcg_out_dat_reg(s, cond, ARITH_MOV, + TCG_REG_R8, 0, TCG_REG_R8, SHIFT_IMM_LSR(16)); + tcg_out_dat_reg(s, cond, ARITH_ORR, + rd, TCG_REG_R8, rn, SHIFT_IMM_LSR(8)); + } +} + +static inline void tcg_out_bswap32(TCGContext *s, int cond, int rd, int rn) +{ + if (use_armv6_instructions) { + /* rev */ + tcg_out32(s, 0x06bf0f30 | (cond << 28) | (rd << 12) | rn); + } else { + tcg_out_dat_reg(s, cond, ARITH_EOR, + TCG_REG_R8, rn, rn, SHIFT_IMM_ROR(16)); + tcg_out_dat_imm(s, cond, ARITH_BIC, + TCG_REG_R8, TCG_REG_R8, 0xff | 0x800); + tcg_out_dat_reg(s, cond, ARITH_MOV, + rd, 0, rn, SHIFT_IMM_ROR(8)); + tcg_out_dat_reg(s, cond, ARITH_EOR, + rd, rd, TCG_REG_R8, SHIFT_IMM_LSR(8)); + } +} + static inline void tcg_out_ld32_12(TCGContext *s, int cond, int rd, int rn, tcg_target_long im) { @@ -1544,6 +1576,13 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, tcg_out_qemu_st(s, COND_AL, args, 3); break; + case INDEX_op_bswap16_i32: + tcg_out_bswap16(s, COND_AL, args[0], args[1]); + break; + case INDEX_op_bswap32_i32: + tcg_out_bswap32(s, COND_AL, args[0], args[1]); + break; + case INDEX_op_ext8s_i32: tcg_out_ext8s(s, COND_AL, args[0], args[1]); break; @@ -1631,6 +1670,9 @@ static const TCGTargetOpDef arm_op_defs[] = { { INDEX_op_qemu_st64, { "x", "D", "x", "X" } }, #endif + { INDEX_op_bswap16_i32, { "r", "r" } }, + { INDEX_op_bswap32_i32, { "r", "r" } }, + { INDEX_op_ext8s_i32, { "r", "r" } }, { INDEX_op_ext16s_i32, { "r", "r" } }, { INDEX_op_ext16u_i32, { "r", "r" } }, diff --git a/tcg/arm/tcg-target.h b/tcg/arm/tcg-target.h index 1f6d665673..d8d7d948ce 100644 --- a/tcg/arm/tcg-target.h +++ b/tcg/arm/tcg-target.h @@ -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 |