diff options
Diffstat (limited to 'arch/alpha/math-emu')
| -rw-r--r-- | arch/alpha/math-emu/ieee-math.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/arch/alpha/math-emu/ieee-math.c b/arch/alpha/math-emu/ieee-math.c index 59d7dfa6d..b3d896389 100644 --- a/arch/alpha/math-emu/ieee-math.c +++ b/arch/alpha/math-emu/ieee-math.c @@ -733,19 +733,23 @@ ieee_CVTQT (int f, unsigned long a, unsigned long *b) * FPCR_INV if invalid operation occurred, etc. */ unsigned long -ieee_CVTTQ (int f, unsigned long a, unsigned long *b) +ieee_CVTTQ (int f, unsigned long a, unsigned long *pb) { unsigned int midway; - unsigned long ov, uv, res = 0; + unsigned long ov, uv, res, b; fpclass_t a_type; EXTENDED temp; - *b = 0; a_type = extend_ieee(a, &temp, DOUBLE); + + b = 0x7fffffffffffffff; + res = FPCR_INV; if (a_type == NaN || a_type == INFTY) - return FPCR_INV; + goto out; + + res = 0; if (a_type == QNaN) - return 0; + goto out; if (temp.e > 0) { ov = 0; @@ -757,7 +761,7 @@ ieee_CVTTQ (int f, unsigned long a, unsigned long *b) if (ov || (temp.f[1] & 0xffc0000000000000)) res |= FPCR_IOV | FPCR_INE; } - if (temp.e < 0) { + else if (temp.e < 0) { while (temp.e < 0) { ++temp.e; uv = temp.f[0] & 1; /* save sticky bit */ @@ -765,7 +769,8 @@ ieee_CVTTQ (int f, unsigned long a, unsigned long *b) temp.f[0] |= uv; } } - *b = ((temp.f[1] << 9) | (temp.f[0] >> 55)) & 0x7fffffffffffffff; + b = (temp.f[1] << 9) | (temp.f[0] >> 55); + /* * Notice: the fraction is only 52 bits long. Thus, rounding * cannot possibly result in an integer overflow. @@ -776,18 +781,18 @@ ieee_CVTTQ (int f, unsigned long a, unsigned long *b) midway = (temp.f[0] & 0x003fffffffffffff) == 0; if ((midway && (temp.f[0] & 0x0080000000000000)) || !midway) - ++*b; + ++b; } break; case ROUND_PINF: if ((temp.f[0] & 0x007fffffffffffff) != 0) - ++*b; + ++b; break; case ROUND_NINF: if ((temp.f[0] & 0x007fffffffffffff) != 0) - --*b; + --b; break; case ROUND_CHOP: @@ -798,8 +803,11 @@ ieee_CVTTQ (int f, unsigned long a, unsigned long *b) res |= FPCR_INE; if (temp.s) { - *b = -*b; + b = -b; } + +out: + *pb = b; return res; } |