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Use the correct flags combination from the load/store routines, and pass along the constant parameter from tcg_out_op. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- tcg/arm/tcg-target.c.inc | 101 ++++++++++++++++++++++++--------------- 1 file changed, 63 insertions(+), 38 deletions(-) diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc index 5157143246..73e0455511 100644 --- a/tcg/arm/tcg-target.c.inc +++ b/tcg/arm/tcg-target.c.inc @@ -1013,50 +1013,71 @@ static inline void tcg_out_ext16u(TCGContext *s, int cond, } } -static inline void tcg_out_bswap16s(TCGContext *s, int cond, int rd, int rn) +static void tcg_out_bswap16(TCGContext *s, int cond, int rd, int rn, int flags) { if (use_armv6_instructions) { - /* revsh */ - tcg_out32(s, 0x06ff0fb0 | (cond << 28) | (rd << 12) | rn); - } else { - tcg_out_dat_reg(s, cond, ARITH_MOV, - TCG_REG_TMP, 0, rn, SHIFT_IMM_LSL(24)); - tcg_out_dat_reg(s, cond, ARITH_MOV, - TCG_REG_TMP, 0, TCG_REG_TMP, SHIFT_IMM_ASR(16)); - tcg_out_dat_reg(s, cond, ARITH_ORR, - rd, TCG_REG_TMP, rn, SHIFT_IMM_LSR(8)); - } -} + if (flags & TCG_BSWAP_OS) { + /* revsh */ + tcg_out32(s, 0x06ff0fb0 | (cond << 28) | (rd << 12) | rn); + return; + } -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_TMP, 0, rn, SHIFT_IMM_LSL(24)); - tcg_out_dat_reg(s, cond, ARITH_MOV, - TCG_REG_TMP, 0, TCG_REG_TMP, SHIFT_IMM_LSR(16)); - tcg_out_dat_reg(s, cond, ARITH_ORR, - rd, TCG_REG_TMP, rn, SHIFT_IMM_LSR(8)); + if ((flags & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) { + /* uxth */ + tcg_out32(s, 0x06ff0070 | (cond << 28) | (rd << 12) | rd); + } + return; } -} -/* swap the two low bytes assuming that the two high input bytes and the - two high output bit can hold any value. */ -static inline void tcg_out_bswap16st(TCGContext *s, int cond, int rd, int rn) -{ - if (use_armv6_instructions) { - /* rev16 */ - tcg_out32(s, 0x06bf0fb0 | (cond << 28) | (rd << 12) | rn); - } else { + if (flags == 0) { + /* + * For stores, no input or output extension: + * rn = xxAB + * lsr tmp, rn, #8 tmp = 0xxA + * and tmp, tmp, #0xff tmp = 000A + * orr rd, tmp, rn, lsl #8 rd = xABA + */ tcg_out_dat_reg(s, cond, ARITH_MOV, TCG_REG_TMP, 0, rn, SHIFT_IMM_LSR(8)); tcg_out_dat_imm(s, cond, ARITH_AND, TCG_REG_TMP, TCG_REG_TMP, 0xff); tcg_out_dat_reg(s, cond, ARITH_ORR, rd, TCG_REG_TMP, rn, SHIFT_IMM_LSL(8)); + return; } + + /* + * Byte swap, leaving the result at the top of the register. + * We will then shift down, zero or sign-extending. + */ + if (flags & TCG_BSWAP_IZ) { + /* + * rn = 00AB + * ror tmp, rn, #8 tmp = B00A + * orr tmp, tmp, tmp, lsl #16 tmp = BA00 + */ + tcg_out_dat_reg(s, cond, ARITH_MOV, + TCG_REG_TMP, 0, rn, SHIFT_IMM_ROR(8)); + tcg_out_dat_reg(s, cond, ARITH_ORR, + TCG_REG_TMP, TCG_REG_TMP, TCG_REG_TMP, + SHIFT_IMM_LSL(16)); + } else { + /* + * rn = xxAB + * and tmp, rn, #0xff00 tmp = 00A0 + * lsl tmp, tmp, #8 tmp = 0A00 + * orr tmp, tmp, rn, lsl #24 tmp = BA00 + */ + tcg_out_dat_rI(s, cond, ARITH_AND, TCG_REG_TMP, rn, 0xff00, 1); + tcg_out_dat_reg(s, cond, ARITH_MOV, + TCG_REG_TMP, 0, TCG_REG_TMP, SHIFT_IMM_LSL(8)); + tcg_out_dat_reg(s, cond, ARITH_ORR, + TCG_REG_TMP, TCG_REG_TMP, rn, SHIFT_IMM_LSL(24)); + } + tcg_out_dat_reg(s, cond, ARITH_MOV, rd, 0, TCG_REG_TMP, + (flags & TCG_BSWAP_OS + ? SHIFT_IMM_ASR(8) : SHIFT_IMM_LSR(8))); } static inline void tcg_out_bswap32(TCGContext *s, int cond, int rd, int rn) @@ -1705,13 +1726,15 @@ static inline void tcg_out_qemu_ld_index(TCGContext *s, MemOp opc, case MO_UW: tcg_out_ld16u_r(s, COND_AL, datalo, addrlo, addend); if (bswap) { - tcg_out_bswap16(s, COND_AL, datalo, datalo); + tcg_out_bswap16(s, COND_AL, datalo, datalo, + TCG_BSWAP_IZ | TCG_BSWAP_OZ); } break; case MO_SW: if (bswap) { tcg_out_ld16u_r(s, COND_AL, datalo, addrlo, addend); - tcg_out_bswap16s(s, COND_AL, datalo, datalo); + tcg_out_bswap16(s, COND_AL, datalo, datalo, + TCG_BSWAP_IZ | TCG_BSWAP_OS); } else { tcg_out_ld16s_r(s, COND_AL, datalo, addrlo, addend); } @@ -1766,13 +1789,15 @@ static inline void tcg_out_qemu_ld_direct(TCGContext *s, MemOp opc, case MO_UW: tcg_out_ld16u_8(s, COND_AL, datalo, addrlo, 0); if (bswap) { - tcg_out_bswap16(s, COND_AL, datalo, datalo); + tcg_out_bswap16(s, COND_AL, datalo, datalo, + TCG_BSWAP_IZ | TCG_BSWAP_OZ); } break; case MO_SW: if (bswap) { tcg_out_ld16u_8(s, COND_AL, datalo, addrlo, 0); - tcg_out_bswap16s(s, COND_AL, datalo, datalo); + tcg_out_bswap16(s, COND_AL, datalo, datalo, + TCG_BSWAP_IZ | TCG_BSWAP_OS); } else { tcg_out_ld16s_8(s, COND_AL, datalo, addrlo, 0); } @@ -1862,7 +1887,7 @@ static inline void tcg_out_qemu_st_index(TCGContext *s, int cond, MemOp opc, break; case MO_16: if (bswap) { - tcg_out_bswap16st(s, cond, TCG_REG_R0, datalo); + tcg_out_bswap16(s, cond, TCG_REG_R0, datalo, 0); tcg_out_st16_r(s, cond, TCG_REG_R0, addrlo, addend); } else { tcg_out_st16_r(s, cond, datalo, addrlo, addend); @@ -1907,7 +1932,7 @@ static inline void tcg_out_qemu_st_direct(TCGContext *s, MemOp opc, break; case MO_16: if (bswap) { - tcg_out_bswap16st(s, COND_AL, TCG_REG_R0, datalo); + tcg_out_bswap16(s, COND_AL, TCG_REG_R0, datalo, 0); tcg_out_st16_8(s, COND_AL, TCG_REG_R0, addrlo, 0); } else { tcg_out_st16_8(s, COND_AL, datalo, addrlo, 0); @@ -2245,7 +2270,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, break; case INDEX_op_bswap16_i32: - tcg_out_bswap16(s, COND_AL, args[0], args[1]); + tcg_out_bswap16(s, COND_AL, args[0], args[1], args[2]); break; case INDEX_op_bswap32_i32: tcg_out_bswap32(s, COND_AL, args[0], args[1]); -- 2.25.1