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authorRichard Henderson <rth@twiddle.net>2014-07-15 12:07:05 -0700
committerRichard Henderson <rth@twiddle.net>2015-05-21 10:33:36 -0700
commit8d8d324e3424bf891d41e9c7758dcc09cf3c38b9 (patch)
tree9b727f276f946e1c531b7849023042b434751796 /target-alpha
parent57a808b6d7f52a62111f6070933dfca6cd88a0fd (diff)
target-alpha: Rewrite helper_zapnot
This form produces significantly smaller code on x86_64. Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-alpha')
-rw-r--r--target-alpha/int_helper.c30
1 files changed, 12 insertions, 18 deletions
diff --git a/target-alpha/int_helper.c b/target-alpha/int_helper.c
index 8e4537f5b7..74f38cbe7b 100644
--- a/target-alpha/int_helper.c
+++ b/target-alpha/int_helper.c
@@ -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;
-
- return op & ~mask;
-}
+ 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;
-uint64_t helper_zap(uint64_t val, uint64_t mask)
-{
- return byte_zap(val, mask);
+ return val & mask;
}
-uint64_t helper_zapnot(uint64_t val, uint64_t mask)
+uint64_t helper_zap(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)