X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Ftarget-i386%2Fcc_helper_template.h;fp=qemu%2Ftarget-i386%2Fcc_helper_template.h;h=607311f1951391655ebbdbc80f1393f5c699b0e7;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git diff --git a/qemu/target-i386/cc_helper_template.h b/qemu/target-i386/cc_helper_template.h new file mode 100644 index 000000000..607311f19 --- /dev/null +++ b/qemu/target-i386/cc_helper_template.h @@ -0,0 +1,242 @@ +/* + * x86 condition code helpers + * + * Copyright (c) 2008 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ + +#define DATA_BITS (1 << (3 + SHIFT)) + +#if DATA_BITS == 8 +#define SUFFIX b +#define DATA_TYPE uint8_t +#elif DATA_BITS == 16 +#define SUFFIX w +#define DATA_TYPE uint16_t +#elif DATA_BITS == 32 +#define SUFFIX l +#define DATA_TYPE uint32_t +#elif DATA_BITS == 64 +#define SUFFIX q +#define DATA_TYPE uint64_t +#else +#error unhandled operand size +#endif + +#define SIGN_MASK (((DATA_TYPE)1) << (DATA_BITS - 1)) + +/* dynamic flags computation */ + +static int glue(compute_all_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src2 = dst - src1; + + cf = dst < src1; + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & CC_A; + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + return dst < src1; +} + +static int glue(compute_all_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1, + DATA_TYPE src3) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src2 = dst - src1 - src3; + + cf = (src3 ? dst <= src1 : dst < src1); + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & 0x10; + zf = (dst == 0) << 6; + sf = lshift(dst, 8 - DATA_BITS) & 0x80; + of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1, + DATA_TYPE src3) +{ + return src3 ? dst <= src1 : dst < src1; +} + +static int glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src1 = dst + src2; + + cf = src1 < src2; + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & CC_A; + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2) +{ + DATA_TYPE src1 = dst + src2; + + return src1 < src2; +} + +static int glue(compute_all_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2, + DATA_TYPE src3) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src1 = dst + src2 + src3; + + cf = (src3 ? src1 <= src2 : src1 < src2); + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & 0x10; + zf = (dst == 0) << 6; + sf = lshift(dst, 8 - DATA_BITS) & 0x80; + of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2, + DATA_TYPE src3) +{ + DATA_TYPE src1 = dst + src2 + src3; + + return (src3 ? src1 <= src2 : src1 < src2); +} + +static int glue(compute_all_logic, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + + cf = 0; + pf = parity_table[(uint8_t)dst]; + af = 0; + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = 0; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_all_inc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src2; + + cf = src1; + src1 = dst - 1; + src2 = 1; + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & CC_A; + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = (dst == SIGN_MASK) * CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_all_dec, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + DATA_TYPE src2; + + cf = src1; + src1 = dst + 1; + src2 = 1; + pf = parity_table[(uint8_t)dst]; + af = (dst ^ src1 ^ src2) & CC_A; + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = (dst == SIGN_MASK - 1) * CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_all_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + + cf = (src1 >> (DATA_BITS - 1)) & CC_C; + pf = parity_table[(uint8_t)dst]; + af = 0; /* undefined */ + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + /* of is defined iff shift count == 1 */ + of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + return (src1 >> (DATA_BITS - 1)) & CC_C; +} + +static int glue(compute_all_sar, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + + cf = src1 & 1; + pf = parity_table[(uint8_t)dst]; + af = 0; /* undefined */ + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + /* of is defined iff shift count == 1 */ + of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O; + return cf | pf | af | zf | sf | of; +} + +/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and + CF are modified and it is slower to do that. Note as well that we + don't truncate SRC1 for computing carry to DATA_TYPE. */ +static int glue(compute_all_mul, SUFFIX)(DATA_TYPE dst, target_long src1) +{ + int cf, pf, af, zf, sf, of; + + cf = (src1 != 0); + pf = parity_table[(uint8_t)dst]; + af = 0; /* undefined */ + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = cf * CC_O; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_all_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + int cf, pf, af, zf, sf, of; + + cf = (src1 == 0); + pf = 0; /* undefined */ + af = 0; /* undefined */ + zf = (dst == 0) * CC_Z; + sf = lshift(dst, 8 - DATA_BITS) & CC_S; + of = 0; + return cf | pf | af | zf | sf | of; +} + +static int glue(compute_c_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1) +{ + return src1 == 0; +} + +#undef DATA_BITS +#undef SIGN_MASK +#undef DATA_TYPE +#undef DATA_MASK +#undef SUFFIX