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compiler/math.bits: use max u64 consts
This commit is contained in:
joe-conigliaro
GitHub
parent
1eeee40278
commit
7583c350b8
@ -778,7 +778,12 @@ fn (p mut Parser) const_decl() {
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// Do not do this when building a module, otherwise the consts
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// will not be accessible.
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if p.pref.build_mode != .build_module && is_compile_time_const(p.cgen.cur_line) {
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p.cgen.const_defines << '#define $name $p.cgen.cur_line'
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mut const_val := p.cgen.cur_line
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// fix `warning: integer literal is too large to be represented in a signed integer type`
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if typ == 'u64' {
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const_val = 'UINT64_C($const_val)'
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}
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p.cgen.const_defines << '#define $name $const_val'
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p.cgen.resetln('')
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p.fgen_nl()
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continue
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@ -10,7 +10,7 @@ import(
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)
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pub fn int_u64(max u64) ?u64 {
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bitlen := bits.len64(max)
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bitlen := bits.len_64(max)
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if bitlen == 0 {
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return u64(0)
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}
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@ -24,53 +24,60 @@ const (
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m3 = 0x00ff00ff00ff00ff // etc.
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m4 = 0x0000ffff0000ffff
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)
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const (
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// save importing math mod just for these
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max_u32 = 4294967295
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max_u64 = 18446744073709551615
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)
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// --- LeadingZeros ---
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// leading_zeros8 returns the number of leading zero bits in x; the result is 8 for x == 0.
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pub fn leading_zeros8(x byte) int {
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return 8 - len8(x)
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// leading_zeros_8 returns the number of leading zero bits in x; the result is 8 for x == 0.
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pub fn leading_zeros_8(x byte) int {
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return 8 - len_8(x)
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}
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// leading_zeros16 returns the number of leading zero bits in x; the result is 16 for x == 0.
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pub fn leading_zeros16(x u16) int {
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return 16 - len16(x)
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// leading_zeros_16 returns the number of leading zero bits in x; the result is 16 for x == 0.
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pub fn leading_zeros_16(x u16) int {
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return 16 - len_16(x)
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}
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// leading_zeros32 returns the number of leading zero bits in x; the result is 32 for x == 0.
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pub fn leading_zeros32(x u32) int {
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return 32 - len32(x)
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// leading_zeros_32 returns the number of leading zero bits in x; the result is 32 for x == 0.
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pub fn leading_zeros_32(x u32) int {
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return 32 - len_32(x)
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}
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// leading_zeros64 returns the number of leading zero bits in x; the result is 64 for x == 0.
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pub fn leading_zeros64(x u64) int {
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return 64 - len64(x)
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// leading_zeros_64 returns the number of leading zero bits in x; the result is 64 for x == 0.
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pub fn leading_zeros_64(x u64) int {
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return 64 - len_64(x)
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}
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// --- TrailingZeros ---
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// trailing_zeros8 returns the number of trailing zero bits in x; the result is 8 for x == 0.
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pub fn trailing_zeros8(x byte) int {
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return int(ntz8_tab[x])
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// trailing_zeros_8 returns the number of trailing zero bits in x; the result is 8 for x == 0.
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pub fn trailing_zeros_8(x byte) int {
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return int(ntz_8_tab[x])
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}
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// trailing_zeros16 returns the number of trailing zero bits in x; the result is 16 for x == 0.
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pub fn trailing_zeros16(x u16) int {
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// trailing_zeros_16 returns the number of trailing zero bits in x; the result is 16 for x == 0.
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pub fn trailing_zeros_16(x u16) int {
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if x == 0 {
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return 16
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}
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// see comment in trailing_zeros64
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// see comment in trailing_zeros_64
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return int(de_bruijn32tab[u32(x & -x) * de_bruijn32>>(32 - 5)])
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}
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// trailing_zeros32 returns the number of trailing zero bits in x; the result is 32 for x == 0.
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pub fn trailing_zeros32(x u32) int {
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// trailing_zeros_32 returns the number of trailing zero bits in x; the result is 32 for x == 0.
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pub fn trailing_zeros_32(x u32) int {
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if x == 0 {
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return 32
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}
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// see comment in trailing_zeros64
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// see comment in trailing_zeros_64
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return int(de_bruijn32tab[(x & -x) * de_bruijn32>>(32 - 5)])
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}
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// trailing_zeros64 returns the number of trailing zero bits in x; the result is 64 for x == 0.
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pub fn trailing_zeros64(x u64) int {
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// trailing_zeros_64 returns the number of trailing zero bits in x; the result is 64 for x == 0.
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pub fn trailing_zeros_64(x u64) int {
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if x == 0 {
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return 64
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}
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@ -89,23 +96,23 @@ pub fn trailing_zeros64(x u64) int {
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}
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// --- OnesCount ---
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// ones_count8 returns the number of one bits ("population count") in x.
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pub fn ones_count8(x byte) int {
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return int(pop8_tab[x])
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// ones_count_8 returns the number of one bits ("population count") in x.
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pub fn ones_count_8(x byte) int {
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return int(pop_8_tab[x])
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}
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// ones_count16 returns the number of one bits ("population count") in x.
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pub fn ones_count16(x u16) int {
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return int(pop8_tab[x>>8] + pop8_tab[x & u16(0xff)])
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// ones_count_16 returns the number of one bits ("population count") in x.
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pub fn ones_count_16(x u16) int {
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return int(pop_8_tab[x>>8] + pop_8_tab[x & u16(0xff)])
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}
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// ones_count32 returns the number of one bits ("population count") in x.
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pub fn ones_count32(x u32) int {
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return int(pop8_tab[x>>24] + pop8_tab[x>>16 & 0xff] + pop8_tab[x>>8 & 0xff] + pop8_tab[x & u32(0xff)])
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// ones_count_32 returns the number of one bits ("population count") in x.
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pub fn ones_count_32(x u32) int {
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return int(pop_8_tab[x>>24] + pop_8_tab[x>>16 & 0xff] + pop_8_tab[x>>8 & 0xff] + pop_8_tab[x & u32(0xff)])
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}
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// ones_count64 returns the number of one bits ("population count") in x.
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pub fn ones_count64(x u64) int {
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// ones_count_64 returns the number of one bits ("population count") in x.
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pub fn ones_count_64(x u64) int {
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// Implementation: Parallel summing of adjacent bits.
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// See "Hacker's Delight", Chap. 5: Counting Bits.
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// The following pattern shows the general approach:
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@ -125,10 +132,9 @@ pub fn ones_count64(x u64) int {
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// Per "Hacker's Delight", the first line can be simplified
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// more, but it saves at best one instruction, so we leave
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// it alone for clarity.
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m := u64(1<<64) - 1
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mut y := (x>>u64(1) & (m0 & m)) + (x & (m0 & m))
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y = (y>>u64(2) & (m1 & m)) + (y & (m1 & m))
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y = ((y>>4) + y) & (m2 & m)
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mut y := (x>>u64(1) & (m0 & max_u64)) + (x & (m0 & max_u64))
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y = (y>>u64(2) & (m1 & max_u64)) + (y & (m1 & max_u64))
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y = ((y>>4) + y) & (m2 & max_u64)
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y += y>>8
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y += y>>16
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y += y>>32
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@ -181,87 +187,83 @@ pub fn rotate_left_64(x u64, k int) u64 {
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}
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// --- Reverse ---
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// reverse8 returns the value of x with its bits in reversed order.
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// reverse_8 returns the value of x with its bits in reversed order.
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[inline]
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pub fn reverse8(x byte) byte {
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return rev8_tab[x]
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pub fn reverse_8(x byte) byte {
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return rev_8_tab[x]
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}
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// reverse16 returns the value of x with its bits in reversed order.
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// reverse_16 returns the value of x with its bits in reversed order.
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[inline]
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pub fn reverse16(x u16) u16 {
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return u16(rev8_tab[x>>8]) | (u16(rev8_tab[x & u16(0xff)])<<8)
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pub fn reverse_16(x u16) u16 {
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return u16(rev_8_tab[x>>8]) | (u16(rev_8_tab[x & u16(0xff)])<<8)
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}
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// reverse32 returns the value of x with its bits in reversed order.
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// reverse_32 returns the value of x with its bits in reversed order.
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[inline]
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pub fn reverse32(x u32) u32 {
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m := u64(1<<32) - 1
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mut y := (x>>u32(1) & (m0 & m) | ((x & (m0 & m))<<1))
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y = (y>>u32(2) & (m1 & m) | ((y & (m1 & m))<<u32(2)))
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y = (y>>u32(4) & (m2 & m) | ((y & (m2 & m))<<u32(4)))
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return reverse_bytes32(y)
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pub fn reverse_32(x u32) u32 {
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mut y := (x>>u32(1) & (m0 & max_u32) | ((x & (m0 & max_u32))<<1))
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y = (y>>u32(2) & (m1 & max_u32) | ((y & (m1 & max_u32))<<u32(2)))
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y = (y>>u32(4) & (m2 & max_u32) | ((y & (m2 & max_u32))<<u32(4)))
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return reverse_bytes_32(y)
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}
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// reverse64 returns the value of x with its bits in reversed order.
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// reverse_64 returns the value of x with its bits in reversed order.
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[inline]
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pub fn reverse64(x u64) u64 {
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m := u64(1<<64) - 1
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mut y := (x>>u64(1) & (m0 & m) | ((x & (m0 & m))<<1))
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y = (y>>u64(2) & (m1 & m) | ((y & (m1 & m))<<2))
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y = (y>>u64(4) & (m2 & m) | ((y & (m2 & m))<<4))
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return reverse_bytes64(y)
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pub fn reverse_64(x u64) u64 {
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mut y := (x>>u64(1) & (m0 & max_u64) | ((x & (m0 & max_u64))<<1))
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y = (y>>u64(2) & (m1 & max_u64) | ((y & (m1 & max_u64))<<2))
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y = (y>>u64(4) & (m2 & max_u64) | ((y & (m2 & max_u64))<<4))
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return reverse_bytes_64(y)
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}
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// --- ReverseBytes ---
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// reverse_bytes16 returns the value of x with its bytes in reversed order.
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// reverse_bytes_16 returns the value of x with its bytes in reversed order.
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//
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// This function's execution time does not depend on the inputs.
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[inline]
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pub fn reverse_bytes16(x u16) u16 {
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pub fn reverse_bytes_16(x u16) u16 {
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return (x>>8) | (x<<8)
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}
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// reverse_bytes32 returns the value of x with its bytes in reversed order.
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// reverse_bytes_32 returns the value of x with its bytes in reversed order.
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//
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// This function's execution time does not depend on the inputs.
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[inline]
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pub fn reverse_bytes32(x u32) u32 {
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m := u64(1<<32) - 1
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y := (x>>u32(8) & (m3 & m) | ((x & (m3 & m))<<u32(8)))
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pub fn reverse_bytes_32(x u32) u32 {
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y := (x>>u32(8) & (m3 & max_u32) | ((x & (m3 & max_u32))<<u32(8)))
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return (y>>16) | (y<<16)
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}
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// reverse_bytes64 returns the value of x with its bytes in reversed order.
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// reverse_bytes_64 returns the value of x with its bytes in reversed order.
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//
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// This function's execution time does not depend on the inputs.
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[inline]
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pub fn reverse_bytes64(x u64) u64 {
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m := u64(1<<64) - 1
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mut y := (x>>u64(8) & (m3 & m) | ((x & (m3 & m))<<u64(8)))
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y = (y>>u64(16) & (m4 & m) | ((y & (m4 & m))<<u64(16)))
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pub fn reverse_bytes_64(x u64) u64 {
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mut y := (x>>u64(8) & (m3 & max_u64) | ((x & (m3 & max_u64))<<u64(8)))
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y = (y>>u64(16) & (m4 & max_u64) | ((y & (m4 & max_u64))<<u64(16)))
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return (y>>32) | (y<<32)
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}
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// --- Len ---
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// len8 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len8(x byte) int {
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return int(len8_tab[x])
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// len_8 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len_8(x byte) int {
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return int(len_8_tab[x])
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}
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// len16 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len16(x u16) int {
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// len_16 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len_16(x u16) int {
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mut y := x
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mut n := 0
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if y >= 1<<8 {
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y >>= 8
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n = 8
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}
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return n + int(len8_tab[y])
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return n + int(len_8_tab[y])
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}
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// len32 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len32(x u32) int {
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// len_32 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len_32(x u32) int {
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mut y := x
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mut n := 0
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if y >= 1<<16 {
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@ -272,11 +274,11 @@ pub fn len32(x u32) int {
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y >>= 8
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n += 8
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}
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return n + int(len8_tab[y])
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return n + int(len_8_tab[y])
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}
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// len64 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len64(x u64) int {
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// len_64 returns the minimum number of bits required to represent x; the result is 0 for x == 0.
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pub fn len_64(x u64) int {
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mut y := x
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mut n := 0
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if y >= u64(1)<<u64(32) {
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@ -291,6 +293,6 @@ pub fn len64(x u64) int {
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y >>= 8
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n += 8
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}
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return n + int(len8_tab[y])
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return n + int(len_8_tab[y])
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}
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@ -4,7 +4,7 @@
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module bits
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const (
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ntz8_tab = [byte(0x08), 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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ntz_8_tab = [byte(0x08), 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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0x04, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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0x05, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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0x04, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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@ -21,7 +21,7 @@ const (
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0x05, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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0x04, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
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]
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pop8_tab = [byte(0x00), 0x01, 0x01, 0x02, 0x01, 0x02, 0x02, 0x03, 0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04,
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pop_8_tab = [byte(0x00), 0x01, 0x01, 0x02, 0x01, 0x02, 0x02, 0x03, 0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04,
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0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,
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0x01, 0x02, 0x02, 0x03, 0x02, 0x03, 0x03, 0x04, 0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05,
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0x02, 0x03, 0x03, 0x04, 0x03, 0x04, 0x04, 0x05, 0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06,
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@ -38,7 +38,7 @@ const (
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0x03, 0x04, 0x04, 0x05, 0x04, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x06, 0x05, 0x06, 0x06, 0x07,
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0x04, 0x05, 0x05, 0x06, 0x05, 0x06, 0x06, 0x07, 0x05, 0x06, 0x06, 0x07, 0x06, 0x07, 0x07, 0x08,
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]
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rev8_tab = [byte(0x00), 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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rev_8_tab = [byte(0x00), 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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@ -55,7 +55,7 @@ const (
|
||||
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
|
||||
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
|
||||
]
|
||||
len8_tab = [byte(0x00), 0x01, 0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
|
||||
len_8_tab = [byte(0x00), 0x01, 0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
|
||||
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
|
||||
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
|
||||
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user