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-rw-r--r--target-alpha/op_helper.c44
1 files changed, 32 insertions, 12 deletions
diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
index ff120ade3b..b2abf6c785 100644
--- a/target-alpha/op_helper.c
+++ b/target-alpha/op_helper.c
@@ -625,37 +625,57 @@ uint64_t helper_sqrtg (uint64_t a)
/* S floating (single) */
+
+/* Taken from linux/arch/alpha/kernel/traps.c, s_mem_to_reg. */
+static inline uint64_t float32_to_s_int(uint32_t fi)
+{
+ uint32_t frac = fi & 0x7fffff;
+ uint32_t sign = fi >> 31;
+ uint32_t exp_msb = (fi >> 30) & 1;
+ uint32_t exp_low = (fi >> 23) & 0x7f;
+ uint32_t exp;
+
+ exp = (exp_msb << 10) | exp_low;
+ if (exp_msb) {
+ if (exp_low == 0x7f)
+ exp = 0x7ff;
+ } else {
+ if (exp_low != 0x00)
+ exp |= 0x380;
+ }
+
+ return (((uint64_t)sign << 63)
+ | ((uint64_t)exp << 52)
+ | ((uint64_t)frac << 29));
+}
+
static inline uint64_t float32_to_s(float32 fa)
{
CPU_FloatU a;
- uint64_t r;
-
a.f = fa;
+ return float32_to_s_int(a.l);
+}
- r = (((uint64_t)(a.l & 0xc0000000)) << 32) | (((uint64_t)(a.l & 0x3fffffff)) << 29);
- if (((a.l & 0x7f800000) != 0x7f800000) && (!(a.l & 0x40000000)))
- r |= 0x7ll << 59;
- return r;
+static inline uint32_t s_to_float32_int(uint64_t a)
+{
+ return ((a >> 32) & 0xc0000000) | ((a >> 29) & 0x3fffffff);
}
static inline float32 s_to_float32(uint64_t a)
{
CPU_FloatU r;
- r.l = ((a >> 32) & 0xc0000000) | ((a >> 29) & 0x3fffffff);
+ r.l = s_to_float32_int(a);
return r.f;
}
uint32_t helper_s_to_memory (uint64_t a)
{
- /* Memory format is the same as float32 */
- float32 fa = s_to_float32(a);
- return *(uint32_t*)(&fa);
+ return s_to_float32_int(a);
}
uint64_t helper_memory_to_s (uint32_t a)
{
- /* Memory format is the same as float32 */
- return float32_to_s(*(float32*)(&a));
+ return float32_to_s_int(a);
}
uint64_t helper_adds (uint64_t a, uint64_t b)