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target-alpha: Rewrite helper_zapnot 

This form produces significantly smaller code on x86_64.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-07-15 12:07:05 -07:00
parent 57a808b6d7
commit 8d8d324e34
1 changed files with 11 additions and 17 deletions
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28
target-alpha/int_helper.c
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@ -37,31 +37,25 @@ uint64_t helper_cttz(uint64_t arg)
return ctz64(arg);
}
static inline uint64_t byte_zap(uint64_t op, uint8_t mskb)
uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
{
uint64_t mask;
mask = 0;
mask |= ((mskb >> 0) & 1) * 0x00000000000000FFULL;
mask |= ((mskb >> 1) & 1) * 0x000000000000FF00ULL;
mask |= ((mskb >> 2) & 1) * 0x0000000000FF0000ULL;
mask |= ((mskb >> 3) & 1) * 0x00000000FF000000ULL;
mask |= ((mskb >> 4) & 1) * 0x000000FF00000000ULL;
mask |= ((mskb >> 5) & 1) * 0x0000FF0000000000ULL;
mask |= ((mskb >> 6) & 1) * 0x00FF000000000000ULL;
mask |= ((mskb >> 7) & 1) * 0xFF00000000000000ULL;
mask = -(mskb & 0x01) & 0x00000000000000ffull;
mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
mask |= -(mskb & 0x80) & 0xff00000000000000ull;
return op & ~mask;
return val & mask;
}
uint64_t helper_zap(uint64_t val, uint64_t mask)
{
return byte_zap(val, mask);
}
uint64_t helper_zapnot(uint64_t val, uint64_t mask)
{
return byte_zap(val, ~mask);
return helper_zapnot(val, ~mask);
}
uint64_t helper_cmpbge(uint64_t op1, uint64_t op2)