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target-sparc: Implement fpack{16,32,fix}.

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Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2011-10-17 18:03:47 -07:00
parent f888300b81
commit 2dedf31497
3 changed files with 96 additions and 1 deletions
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64
target-sparc/vis_helper.c
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@ -417,3 +417,67 @@ uint64_t helper_pdist(uint64_t sum, uint64_t src1, uint64_t src2)
return sum;
}
uint32_t helper_fpack16(uint64_t gsr, uint64_t rs2)
{
int scale = (gsr >> 3) & 0xf;
uint32_t ret = 0;
int byte;
for (byte = 0; byte < 4; byte++) {
uint32_t val;
int16_t src = rs2 >> (byte * 16);
int32_t scaled = src << scale;
int32_t from_fixed = scaled >> 7;
val = (from_fixed < 0 ? 0 :
from_fixed > 255 ? 255 : from_fixed);
ret |= val << (8 * byte);
}
return ret;
}
uint64_t helper_fpack32(uint64_t gsr, uint64_t rs1, uint64_t rs2)
{
int scale = (gsr >> 3) & 0x1f;
uint64_t ret = 0;
int word;
ret = (rs1 << 8) & ~(0x000000ff000000ffULL);
for (word = 0; word < 2; word++) {
uint64_t val;
int32_t src = rs2 >> (word * 32);
int64_t scaled = (int64_t)src << scale;
int64_t from_fixed = scaled >> 23;
val = (from_fixed < 0 ? 0 :
(from_fixed > 255) ? 255 : from_fixed);
ret |= val << (32 * word);
}
return ret;
}
uint32_t helper_fpackfix(uint64_t gsr, uint64_t rs2)
{
int scale = (gsr >> 3) & 0x1f;
uint32_t ret = 0;
int word;
for (word = 0; word < 2; word++) {
uint32_t val;
int32_t src = rs2 >> (word * 32);
int64_t scaled = src << scale;
int64_t from_fixed = scaled >> 16;
val = (from_fixed < -32768 ? -32768 :
from_fixed > 32767 ? 32767 : from_fixed);
ret |= (val & 0xffff) << (word * 16);
}
return ret;
}