mips/net/bpf_jit_comp32.c

947 static void emit_movz_r(struct jit_context *ctx, u8 rd, u8 rs, u8 rt)
950 		emit(ctx, movz, rd, rs, rt);           /* rd = rt ? rd : rs  */
954 		emit(ctx, selnez, rd, rd, rt);         /* rd = 0 if rt != 0  */
956 			emit(ctx, or, rd, rd, rs);     /* rd = rd | rs       */
958 		emit(ctx, bnez, rt, 8);                /* PC += 8 if rd != 0 */
960 		emit(ctx, or, rd, rs, MIPS_R_ZERO);    /* +4: rd = rs        */
962 	clobber_reg(ctx, rd);
970 static void emit_movn_r(struct jit_context *ctx, u8 rd, u8 rs, u8 rt)
973 		emit(ctx, movn, rd, rs, rt);           /* rd = rt ? rs : rd  */
977 		emit(ctx, seleqz, rd, rd, rt);         /* rd = 0 if rt != 0  */
979 			emit(ctx, or, rd, rd, rs);     /* rd = rd | rs       */
981 		emit(ctx, beqz, rt, 8);                /* PC += 8 if rd == 0 */
983 		emit(ctx, or, rd, rs, MIPS_R_ZERO);    /* +4: rd = rs        */
985 	clobber_reg(ctx, rd);
989 /* Emulation of 64-bit sltiu rd, rs, imm, where imm may be S32_MAX + 1 */
990 static void emit_sltiu_r64(struct jit_context *ctx, u8 rd,
996 		emit_mov_i(ctx, rd, imm);                 /* rd = imm        */
997 		emit(ctx, sltu, rd, lo(rs), rd);          /* rd = rsl < rd   */
999 		emit(ctx, or, rd, rd, tmp);               /* rd = rd | tmp   */
1002 			emit_mov_i(ctx, rd, (s32)imm);     /* rd = imm       */
1003 			emit(ctx, sltu, rd, lo(rs), rd);   /* rd = rsl < rd  */
1005 			emit(ctx, sltiu, rd, lo(rs), imm); /* rd = rsl < imm */
1007 		emit_movn_r(ctx, rd, MIPS_R_ZERO, hi(rs)); /* rd = 0 if rsh  */
1011 /* Emulation of 64-bit sltu rd, rs, rt */
1012 static void emit_sltu_r64(struct jit_context *ctx, u8 rd,
1017 	emit(ctx, sltu, rd, lo(rs), lo(rt));           /* rd = rsl < rtl     */
1019 	emit_movn_r(ctx, rd, MIPS_R_ZERO, tmp);        /* rd = 0 if tmp != 0 */
1021 	emit(ctx, or, rd, rd, tmp);                    /* rd = rd | tmp      */
1024 /* Emulation of 64-bit slti rd, rs, imm, where imm may be S32_MAX + 1 */
1025 static void emit_slti_r64(struct jit_context *ctx, u8 rd,
1036 	emit_mov_i(ctx, rd, (s32)imm);
1037 	emit(ctx, sltu, t1, lo(rs), rd);               /* t1 = rsl <u imm   */
1038 	emit(ctx, sltu, t2, rd, lo(rs));               /* t2 = imm <u rsl   */
1039 	emit(ctx, srl, rd, hi(rs), 31);                /* rd = rsh >> 31    */
1041 		emit_movz_r(ctx, t1, t2, rd);          /* t1 = rd ? t1 : t2 */
1043 		emit_movn_r(ctx, t1, t2, rd);          /* t1 = rd ? t2 : t1 */
1050 		emit(ctx, addiu, rd, hi(rs), 1);       /* rd = rsh + 1 */
1051 		cmp = rd;
1058 	 * if (imm < 0) rd = rsh < -1
1059 	 * else         rd = rsh != 0
1060 	 * rd = rd | t1
1062 	emit(ctx, slti, rd, hi(rs), imm < 0 ? -1 : 0); /* rd = rsh < hi(imm) */
1063 	emit(ctx, or, rd, rd, t1);                     /* rd = rd | t1       */
1066 /* Emulation of 64-bit(slt rd, rs, rt) */
1067 static void emit_slt_r64(struct jit_context *ctx, u8 rd,
1082 	emit(ctx, srl, rd, t3, 31);                    /* rd = t3 >> 31     */
1083 	emit_movn_r(ctx, t1, t2, rd);                  /* t1 = rd ? t2 : t1 */
1086 	/* rd = (rsh < rth) | t1 */
1087 	emit(ctx, slt, rd, hi(rs), hi(rt));            /* rd = rsh <s rth   */
1088 	emit(ctx, or, rd, rd, t1);                     /* rd = rd | t1      */