target-i386: Don't reference ENV through most of cc helpers

In preparation for making this a const helper.

By using the proper types in the parameters to the helper functions,
we get to avoid quite a lot of subsequent casting.
Signed-off-by: NRichard Henderson <rth@twiddle.net>

target-i386/cc_helper.c

@@ -75,125 +75,108 @@ const uint8_t parity_table[256] = {
 
 #endif
 
-static int compute_all_eflags(CPUX86State *env)
-{
-    return CC_SRC;
-}
-
-static int compute_c_eflags(CPUX86State *env)
-{
-    return CC_SRC & CC_C;
-}
-
 uint32_t helper_cc_compute_all(CPUX86State *env, int op)
 {
+    target_ulong dst = CC_DST, src1 = CC_SRC;
+
     switch (op) {
     default: /* should never happen */
         return 0;
 
     case CC_OP_EFLAGS:
-        return compute_all_eflags(env);
+        return src1;
 
     case CC_OP_MULB:
-        return compute_all_mulb(env);
+        return compute_all_mulb(dst, src1);
     case CC_OP_MULW:
-        return compute_all_mulw(env);
+        return compute_all_mulw(dst, src1);
     case CC_OP_MULL:
-        return compute_all_mull(env);
+        return compute_all_mull(dst, src1);
 
     case CC_OP_ADDB:
-        return compute_all_addb(env);
+        return compute_all_addb(dst, src1);
     case CC_OP_ADDW:
-        return compute_all_addw(env);
+        return compute_all_addw(dst, src1);
     case CC_OP_ADDL:
-        return compute_all_addl(env);
+        return compute_all_addl(dst, src1);
 
     case CC_OP_ADCB:
-        return compute_all_adcb(env);
+        return compute_all_adcb(dst, src1);
     case CC_OP_ADCW:
-        return compute_all_adcw(env);
+        return compute_all_adcw(dst, src1);
     case CC_OP_ADCL:
-        return compute_all_adcl(env);
+        return compute_all_adcl(dst, src1);
 
     case CC_OP_SUBB:
-        return compute_all_subb(env);
+        return compute_all_subb(dst, src1);
     case CC_OP_SUBW:
-        return compute_all_subw(env);
+        return compute_all_subw(dst, src1);
     case CC_OP_SUBL:
-        return compute_all_subl(env);
+        return compute_all_subl(dst, src1);
 
     case CC_OP_SBBB:
-        return compute_all_sbbb(env);
+        return compute_all_sbbb(dst, src1);
     case CC_OP_SBBW:
-        return compute_all_sbbw(env);
+        return compute_all_sbbw(dst, src1);
     case CC_OP_SBBL:
-        return compute_all_sbbl(env);
+        return compute_all_sbbl(dst, src1);
 
     case CC_OP_LOGICB:
-        return compute_all_logicb(env);
+        return compute_all_logicb(dst, src1);
     case CC_OP_LOGICW:
-        return compute_all_logicw(env);
+        return compute_all_logicw(dst, src1);
     case CC_OP_LOGICL:
-        return compute_all_logicl(env);
+        return compute_all_logicl(dst, src1);
 
     case CC_OP_INCB:
-        return compute_all_incb(env);
+        return compute_all_incb(dst, src1);
     case CC_OP_INCW:
-        return compute_all_incw(env);
+        return compute_all_incw(dst, src1);
     case CC_OP_INCL:
-        return compute_all_incl(env);
+        return compute_all_incl(dst, src1);
 
     case CC_OP_DECB:
-        return compute_all_decb(env);
+        return compute_all_decb(dst, src1);
     case CC_OP_DECW:
-        return compute_all_decw(env);
+        return compute_all_decw(dst, src1);
     case CC_OP_DECL:
-        return compute_all_decl(env);
+        return compute_all_decl(dst, src1);
 
     case CC_OP_SHLB:
-        return compute_all_shlb(env);
+        return compute_all_shlb(dst, src1);
     case CC_OP_SHLW:
-        return compute_all_shlw(env);
+        return compute_all_shlw(dst, src1);
     case CC_OP_SHLL:
-        return compute_all_shll(env);
+        return compute_all_shll(dst, src1);
 
     case CC_OP_SARB:
-        return compute_all_sarb(env);
+        return compute_all_sarb(dst, src1);
     case CC_OP_SARW:
-        return compute_all_sarw(env);
+        return compute_all_sarw(dst, src1);
     case CC_OP_SARL:
-        return compute_all_sarl(env);
+        return compute_all_sarl(dst, src1);
 
 #ifdef TARGET_X86_64
     case CC_OP_MULQ:
-        return compute_all_mulq(env);
-
+        return compute_all_mulq(dst, src1);
     case CC_OP_ADDQ:
-        return compute_all_addq(env);
-
+        return compute_all_addq(dst, src1);
     case CC_OP_ADCQ:
-        return compute_all_adcq(env);
-
+        return compute_all_adcq(dst, src1);
     case CC_OP_SUBQ:
-        return compute_all_subq(env);
-
+        return compute_all_subq(dst, src1);
     case CC_OP_SBBQ:
-        return compute_all_sbbq(env);
-
+        return compute_all_sbbq(dst, src1);
     case CC_OP_LOGICQ:
-        return compute_all_logicq(env);
-
+        return compute_all_logicq(dst, src1);
     case CC_OP_INCQ:
-        return compute_all_incq(env);
-
+        return compute_all_incq(dst, src1);
     case CC_OP_DECQ:
-        return compute_all_decq(env);
-
+        return compute_all_decq(dst, src1);
     case CC_OP_SHLQ:
-        return compute_all_shlq(env);
-
+        return compute_all_shlq(dst, src1);
     case CC_OP_SARQ:
-        return compute_all_sarq(env);
+        return compute_all_sarq(dst, src1);
 #endif
     }
 }
@@ -205,113 +188,85 @@ uint32_t cpu_cc_compute_all(CPUX86State *env, int op)
 
 uint32_t helper_cc_compute_c(CPUX86State *env, int op)
 {
+    target_ulong dst = CC_DST, src1 = CC_SRC;
+
     switch (op) {
     default: /* should never happen */
+    case CC_OP_LOGICB:
+    case CC_OP_LOGICW:
+    case CC_OP_LOGICL:
+    case CC_OP_LOGICQ:
         return 0;
 
     case CC_OP_EFLAGS:
-        return compute_c_eflags(env);
+    case CC_OP_SARB:
+    case CC_OP_SARW:
+    case CC_OP_SARL:
+    case CC_OP_SARQ:
+        return src1 & 1;
+
+    case CC_OP_INCB:
+    case CC_OP_INCW:
+    case CC_OP_INCL:
+    case CC_OP_INCQ:
+    case CC_OP_DECB:
+    case CC_OP_DECW:
+    case CC_OP_DECL:
+    case CC_OP_DECQ:
+        return src1;
 
     case CC_OP_MULB:
-        return compute_c_mull(env);
     case CC_OP_MULW:
-        return compute_c_mull(env);
     case CC_OP_MULL:
-        return compute_c_mull(env);
+    case CC_OP_MULQ:
+        return src1 != 0;
 
     case CC_OP_ADDB:
-        return compute_c_addb(env);
+        return compute_c_addb(dst, src1);
     case CC_OP_ADDW:
-        return compute_c_addw(env);
+        return compute_c_addw(dst, src1);
     case CC_OP_ADDL:
-        return compute_c_addl(env);
+        return compute_c_addl(dst, src1);
 
     case CC_OP_ADCB:
-        return compute_c_adcb(env);
+        return compute_c_adcb(dst, src1);
     case CC_OP_ADCW:
-        return compute_c_adcw(env);
+        return compute_c_adcw(dst, src1);
     case CC_OP_ADCL:
-        return compute_c_adcl(env);
+        return compute_c_adcl(dst, src1);
 
     case CC_OP_SUBB:
-        return compute_c_subb(env);
+        return compute_c_subb(dst, src1);
     case CC_OP_SUBW:
-        return compute_c_subw(env);
+        return compute_c_subw(dst, src1);
     case CC_OP_SUBL:
-        return compute_c_subl(env);
+        return compute_c_subl(dst, src1);
 
     case CC_OP_SBBB:
-        return compute_c_sbbb(env);
+        return compute_c_sbbb(dst, src1);
     case CC_OP_SBBW:
-        return compute_c_sbbw(env);
+        return compute_c_sbbw(dst, src1);
     case CC_OP_SBBL:
-        return compute_c_sbbl(env);
-
-    case CC_OP_LOGICB:
-        return compute_c_logicb();
-    case CC_OP_LOGICW:
-        return compute_c_logicw();
-    case CC_OP_LOGICL:
-        return compute_c_logicl();
-
-    case CC_OP_INCB:
-        return compute_c_incl(env);
-    case CC_OP_INCW:
-        return compute_c_incl(env);
-    case CC_OP_INCL:
-        return compute_c_incl(env);
-
-    case CC_OP_DECB:
-        return compute_c_incl(env);
-    case CC_OP_DECW:
-        return compute_c_incl(env);
-    case CC_OP_DECL:
-        return compute_c_incl(env);
+        return compute_c_sbbl(dst, src1);
 
     case CC_OP_SHLB:
-        return compute_c_shlb(env);
+        return compute_c_shlb(dst, src1);
     case CC_OP_SHLW:
-        return compute_c_shlw(env);
+        return compute_c_shlw(dst, src1);
     case CC_OP_SHLL:
-        return compute_c_shll(env);
-
-    case CC_OP_SARB:
-        return compute_c_sarl(env);
-    case CC_OP_SARW:
-        return compute_c_sarl(env);
-    case CC_OP_SARL:
-        return compute_c_sarl(env);
+        return compute_c_shll(dst, src1);
 
 #ifdef TARGET_X86_64
-    case CC_OP_MULQ:
-        return compute_c_mull(env);
-
     case CC_OP_ADDQ:
-        return compute_c_addq(env);
-
+        return compute_c_addq(dst, src1);
     case CC_OP_ADCQ:
-        return compute_c_adcq(env);
-
+        return compute_c_adcq(dst, src1);
     case CC_OP_SUBQ:
-        return compute_c_subq(env);
-
+        return compute_c_subq(dst, src1);
     case CC_OP_SBBQ:
-        return compute_c_sbbq(env);
-
-    case CC_OP_LOGICQ:
-        return compute_c_logicq();
-
-    case CC_OP_INCQ:
-        return compute_c_incl(env);
-
-    case CC_OP_DECQ:
-        return compute_c_incl(env);
-
+        return compute_c_sbbq(dst, src1);
     case CC_OP_SHLQ:
-        return compute_c_shlq(env);
-
-    case CC_OP_SARQ:
-        return compute_c_sarl(env);
+        return compute_c_shlq(dst, src1);
 #endif
     }
 }

target-i386/cc_helper_template.h

@@ -18,255 +18,198 @@
  */
 
 #define DATA_BITS (1 << (3 + SHIFT))
-#define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1))
 
 #if DATA_BITS == 8
 #define SUFFIX b
 #define DATA_TYPE uint8_t
-#define DATA_MASK 0xff
 #elif DATA_BITS == 16
 #define SUFFIX w
 #define DATA_TYPE uint16_t
-#define DATA_MASK 0xffff
 #elif DATA_BITS == 32
 #define SUFFIX l
 #define DATA_TYPE uint32_t
-#define DATA_MASK 0xffffffff
 #elif DATA_BITS == 64
 #define SUFFIX q
 #define DATA_TYPE uint64_t
-#define DATA_MASK 0xffffffffffffffffULL
 #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)(CPUX86State *env)
+static int glue(compute_all_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
-
-    src1 = CC_SRC;
-    src2 = CC_DST - CC_SRC;
-    cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
+    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)(CPUX86State *env)
+static int glue(compute_c_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
-    int cf;
-    target_long src1;
-
-    src1 = CC_SRC;
-    cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
-    return cf;
+    return dst < src1;
 }
 
-static int glue(compute_all_adc, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
-
-    src1 = CC_SRC;
-    src2 = CC_DST - CC_SRC - 1;
-    cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
+    DATA_TYPE src2 = dst - src1 - 1;
+
+    cf = 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)(CPUX86State *env)
+static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
-    int cf;
-    target_long src1;
-
-    src1 = CC_SRC;
-    cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
-    return cf;
+    return dst <= src1;
 }
 
-static int glue(compute_all_sub, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
-
-    src1 = CC_DST + CC_SRC;
-    src2 = CC_SRC;
-    cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
+    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)(CPUX86State *env)
+static int glue(compute_c_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
 {
-    int cf;
-    target_long src1, src2;
+    DATA_TYPE src1 = dst + src2;
 
-    src1 = CC_DST + CC_SRC;
-    src2 = CC_SRC;
-    cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
-    return cf;
+    return src1 < src2;
 }
 
-static int glue(compute_all_sbb, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
-
-    src1 = CC_DST + CC_SRC + 1;
-    src2 = CC_SRC;
-    cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
+    DATA_TYPE src1 = dst + src2 + 1;
+
+    cf = 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)(CPUX86State *env)
+static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
 {
-    int cf;
-    target_long src1, src2;
+    DATA_TYPE src1 = dst + src2 + 1;
 
-    src1 = CC_DST + CC_SRC + 1;
-    src2 = CC_SRC;
-    cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
-    return cf;
+    return src1 <= src2;
 }
 
-static int glue(compute_all_logic, SUFFIX)(CPUX86State *env)
+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)CC_DST];
+    pf = parity_table[(uint8_t)dst];
     af = 0;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
+    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_logic, SUFFIX)(void)
-{
-    return 0;
-}
-
-static int glue(compute_all_inc, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_inc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
+    DATA_TYPE src2;
 
-    src1 = CC_DST - 1;
+    cf = src1;
+    src1 = dst - 1;
     src2 = 1;
-    cf = CC_SRC;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11;
+    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;
 }
 
-#if DATA_BITS == 32
-static int glue(compute_c_inc, SUFFIX)(CPUX86State *env)
-{
-    return CC_SRC;
-}
-#endif
-
-static int glue(compute_all_dec, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_dec, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
-    target_long src1, src2;
+    DATA_TYPE src2;
 
-    src1 = CC_DST + 1;
+    cf = src1;
+    src1 = dst + 1;
     src2 = 1;
-    cf = CC_SRC;
-    pf = parity_table[(uint8_t)CC_DST];
-    af = (CC_DST ^ src1 ^ src2) & 0x10;
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11;
+    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)(CPUX86State *env)
+static int glue(compute_all_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
 
-    cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C;
-    pf = parity_table[(uint8_t)CC_DST];
+    cf = (src1 >> (DATA_BITS - 1)) & CC_C;
+    pf = parity_table[(uint8_t)dst];
     af = 0; /* undefined */
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    /* of is defined if shift count == 1 */
-    of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
+    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)(CPUX86State *env)
+static int glue(compute_c_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
-    return (CC_SRC >> (DATA_BITS - 1)) & CC_C;
+    return (src1 >> (DATA_BITS - 1)) & CC_C;
 }
 
-#if DATA_BITS == 32
-static int glue(compute_c_sar, SUFFIX)(CPUX86State *env)
-{
-    return CC_SRC & 1;
-}
-#endif
-
-static int glue(compute_all_sar, SUFFIX)(CPUX86State *env)
+static int glue(compute_all_sar, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
 {
     int cf, pf, af, zf, sf, of;
 
-    cf = CC_SRC & 1;
-    pf = parity_table[(uint8_t)CC_DST];
+    cf = src1 & 1;
+    pf = parity_table[(uint8_t)dst];
     af = 0; /* undefined */
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    /* of is defined if shift count == 1 */
-    of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
+    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;
 }
 
-#if DATA_BITS == 32
-static int glue(compute_c_mul, SUFFIX)(CPUX86State *env)
-{
-    int cf;
-
-    cf = (CC_SRC != 0);
-    return cf;
-}
-#endif
-
 /* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
-   CF are modified and it is slower to do that. */
-static int glue(compute_all_mul, SUFFIX)(CPUX86State *env)
+   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 = (CC_SRC != 0);
-    pf = parity_table[(uint8_t)CC_DST];
+    cf = (src1 != 0);
+    pf = parity_table[(uint8_t)dst];
     af = 0; /* undefined */
-    zf = ((DATA_TYPE)CC_DST == 0) << 6;
-    sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
-    of = cf << 11;
+    zf = (dst == 0) * CC_Z;
+    sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+    of = cf * CC_O;
     return cf | pf | af | zf | sf | of;
 }