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Matthew Barr
2017-05-03 14:47:01 +10:00
parent 923e602601
commit c510b85bf1
5 changed files with 25 additions and 25 deletions
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30
unit/internal/bitutils.cpp
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@@ -36,26 +36,26 @@
// open coded implementations to test against
static
u32 our_clz(u32 x) {
u32 n;
u32 n;
if (x == 0) return(32);
n = 0;
if (x <= 0x0000FFFF) { n = n + 16; x = x << 16; }
if (x <= 0x00FFFFFF) { n = n + 8; x = x << 8; }
if (x <= 0x0FFFFFFF) { n = n + 4; x = x << 4; }
if (x <= 0x3FFFFFFF) { n = n + 2; x = x << 2; }
if (x <= 0x7FFFFFFF) { n = n + 1; }
return n;
if (x == 0) return(32);
n = 0;
if (x <= 0x0000FFFF) { n = n + 16; x = x << 16; }
if (x <= 0x00FFFFFF) { n = n + 8; x = x << 8; }
if (x <= 0x0FFFFFFF) { n = n + 4; x = x << 4; }
if (x <= 0x3FFFFFFF) { n = n + 2; x = x << 2; }
if (x <= 0x7FFFFFFF) { n = n + 1; }
return n;
}
static
u32 our_clzll(u64a x) {
// Synthesise from 32-bit variant.
u32 high = x >> 32;
if (high) {
return our_clz(high);
}
return 32 + our_clz(x);
// Synthesise from 32-bit variant.
u32 high = x >> 32;
if (high) {
return our_clz(high);
}
return 32 + our_clz(x);
}