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author | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-05-16 11:59:40 +0000 |
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committer | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-05-16 11:59:40 +0000 |
commit | 69d357286d0ab5a852e827dad1dc4b05917aaaa8 (patch) | |
tree | dbf5fae9642821155fdb93539c266e7c5dc12406 /target-i386 | |
parent | 100ce98812c2624a7e7922055d80ebbd81e8caa9 (diff) | |
download | hqemu-69d357286d0ab5a852e827dad1dc4b05917aaaa8.zip hqemu-69d357286d0ab5a852e827dad1dc4b05917aaaa8.tar.gz |
More generic 64 bit multiplication support, by Aurelien Jarno.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2821 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'target-i386')
-rw-r--r-- | target-i386/helper.c | 50 |
1 files changed, 3 insertions, 47 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c index 4656596..20c1f57 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -3620,50 +3620,6 @@ static void neg128(uint64_t *plow, uint64_t *phigh) add128(plow, phigh, 1, 0); } -static void mul64(uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) -{ - uint32_t a0, a1, b0, b1; - uint64_t v; - - a0 = a; - a1 = a >> 32; - - b0 = b; - b1 = b >> 32; - - v = (uint64_t)a0 * (uint64_t)b0; - *plow = v; - *phigh = 0; - - v = (uint64_t)a0 * (uint64_t)b1; - add128(plow, phigh, v << 32, v >> 32); - - v = (uint64_t)a1 * (uint64_t)b0; - add128(plow, phigh, v << 32, v >> 32); - - v = (uint64_t)a1 * (uint64_t)b1; - *phigh += v; -#ifdef DEBUG_MULDIV - printf("mul: 0x%016" PRIx64 " * 0x%016" PRIx64 " = 0x%016" PRIx64 "%016" PRIx64 "\n", - a, b, *phigh, *plow); -#endif -} - -static void imul64(uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b) -{ - int sa, sb; - sa = (a < 0); - if (sa) - a = -a; - sb = (b < 0); - if (sb) - b = -b; - mul64(plow, phigh, a, b); - if (sa ^ sb) { - neg128(plow, phigh); - } -} - /* return TRUE if overflow */ static int div64(uint64_t *plow, uint64_t *phigh, uint64_t b) { @@ -3731,7 +3687,7 @@ void helper_mulq_EAX_T0(void) { uint64_t r0, r1; - mul64(&r0, &r1, EAX, T0); + mulu64(&r1, &r0, EAX, T0); EAX = r0; EDX = r1; CC_DST = r0; @@ -3742,7 +3698,7 @@ void helper_imulq_EAX_T0(void) { uint64_t r0, r1; - imul64(&r0, &r1, EAX, T0); + muls64(&r1, &r0, EAX, T0); EAX = r0; EDX = r1; CC_DST = r0; @@ -3753,7 +3709,7 @@ void helper_imulq_T0_T1(void) { uint64_t r0, r1; - imul64(&r0, &r1, T0, T1); + muls64(&r1, &r0, T0, T1); T0 = r0; CC_DST = r0; CC_SRC = ((int64_t)r1 != ((int64_t)r0 >> 63)); |