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Add builtins ffs, clz, ctz, clrsb, popcount, parity
Add new file lib/builtin.c Modify include/tccdefs.h, lib/Makefile to compile it. Update tests/tcctest.c to test it.
This commit is contained in:
herman ten brugge
parent
ea0c57e90a
commit
dd69143ae6
@ -309,4 +309,19 @@
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#undef __MAYBE_REDIR
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#undef __RENAME
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#if !defined _WIN32
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#define __BUILTIN_EXTERN(name,u) \
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int __builtin_##name(u int); \
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int __builtin_##name##l(u long); \
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int __builtin_##name##ll(u long long);
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__BUILTIN_EXTERN(ffs,)
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__BUILTIN_EXTERN(clz, unsigned)
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__BUILTIN_EXTERN(ctz, unsigned)
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__BUILTIN_EXTERN(clrsb,)
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__BUILTIN_EXTERN(popcount, unsigned)
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__BUILTIN_EXTERN(parity, unsigned)
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#undef __BUILTIN_EXTERN
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#endif
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#endif /* ndef __TCC_PP__ */
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10
lib/Makefile
10
lib/Makefile
@ -42,11 +42,11 @@ $(X)BT_O += tcov.o
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DSO_O = dsohandle.o
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I386_O = libtcc1.o alloca.o alloca-bt.o stdatomic.o atomic.o $(BT_O)
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X86_64_O = libtcc1.o alloca.o alloca-bt.o stdatomic.o atomic.o $(BT_O)
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ARM_O = libtcc1.o armeabi.o alloca.o armflush.o stdatomic.o atomic.o $(BT_O)
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ARM64_O = lib-arm64.o stdatomic.o atomic.o $(BT_O)
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RISCV64_O = lib-arm64.o stdatomic.o atomic.o $(BT_O)
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I386_O = libtcc1.o alloca.o alloca-bt.o stdatomic.o atomic.o builtin.o $(BT_O)
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X86_64_O = libtcc1.o alloca.o alloca-bt.o stdatomic.o atomic.o builtin.o $(BT_O)
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ARM_O = libtcc1.o armeabi.o alloca.o armflush.o stdatomic.o atomic.o builtin.o $(BT_O)
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ARM64_O = lib-arm64.o stdatomic.o atomic.o builtin.o $(BT_O)
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RISCV64_O = lib-arm64.o stdatomic.o atomic.o builtin.o $(BT_O)
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WIN_O = crt1.o crt1w.o wincrt1.o wincrt1w.o dllcrt1.o dllmain.o
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OBJ-i386 = $(I386_O) $(BCHECK_O) $(DSO_O)
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124
lib/builtin.c
Normal file
124
lib/builtin.c
Normal file
@ -0,0 +1,124 @@
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/* ---------------------------------------------- */
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/* This file implements:
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* __builtin_ffs
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* __builtin_clz
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* __builtin_ctz
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* __builtin_clrsb
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* __builtin_popcount
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* __builtin_parity
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* for int, long and long long
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*/
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static const unsigned char table_1_32[] = {
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0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
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31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
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};
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static const unsigned char table_2_32[32] = {
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31, 22, 30, 21, 18, 10, 29, 2, 20, 17, 15, 13, 9, 6, 28, 1,
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23, 19, 11, 3, 16, 14, 7, 24, 12, 4, 8, 25, 5, 26, 27, 0
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};
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static const unsigned char table_1_64[] = {
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0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
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62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
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63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,
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51, 25, 36, 32, 60, 20, 57, 16, 50, 31, 19, 15, 30, 14, 13, 12
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};
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static const unsigned char table_2_64[] = {
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63, 16, 62, 7, 15, 36, 61, 3, 6, 14, 22, 26, 35, 47, 60, 2,
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9, 5, 28, 11, 13, 21, 42, 19, 25, 31, 34, 40, 46, 52, 59, 1,
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17, 8, 37, 4, 23, 27, 48, 10, 29, 12, 43, 20, 32, 41, 53, 18,
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38, 24, 49, 30, 44, 33, 54, 39, 50, 45, 55, 51, 56, 57, 58, 0
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};
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#define FFSI(x) \
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return table_1_32[((x & -x) * 0x077cb531u) >> 27] + (x != 0);
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#define FFSL(x) \
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return table_1_64[((x & -x) * 0x022fdd63cc95386dull) >> 58] + (x != 0);
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#define CTZI(x) \
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return table_1_32[((x & -x) * 0x077cb531u) >> 27];
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#define CTZL(x) \
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return table_1_64[((x & -x) * 0x022fdd63cc95386dull) >> 58];
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#define CLZI(x) \
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x |= x >> 1; \
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x |= x >> 2; \
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x |= x >> 4; \
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x |= x >> 8; \
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x |= x >> 16; \
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return table_2_32[(x * 0x07c4acddu) >> 27];
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#define CLZL(x) \
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x |= x >> 1; \
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x |= x >> 2; \
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x |= x >> 4; \
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x |= x >> 8; \
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x |= x >> 16; \
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x |= x >> 32; \
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return table_2_64[x * 0x03f79d71b4cb0a89ull >> 58];
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#define POPCOUNTI(x, m) \
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x = x - ((x >> 1) & 0x55555555); \
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x = (x & 0x33333333) + ((x >> 2) & 0x33333333); \
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x = (x + (x >> 4)) & 0xf0f0f0f; \
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return ((x * 0x01010101) >> 24) & m;
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#define POPCOUNTL(x, m) \
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x = x - ((x >> 1) & 0x5555555555555555ull); \
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x = (x & 0x3333333333333333ull) + ((x >> 2) & 0x3333333333333333ull); \
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x = (x + (x >> 4)) & 0xf0f0f0f0f0f0f0full; \
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return ((x * 0x0101010101010101ull) >> 56) & m;
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/* Returns one plus the index of the least significant 1-bit of x,
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or if x is zero, returns zero. */
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int __builtin_ffs (int x) { FFSI(x) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_ffsl (long x) { FFSI(x) }
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#else
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int __builtin_ffsl (long x) { FFSL(x) }
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#endif
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int __builtin_ffsll (long long x) { FFSL(x) }
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/* Returns the number of leading 0-bits in x, starting at the most significant
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bit position. If x is 0, the result is undefined. */
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int __builtin_clz (unsigned int x) { CLZI(x) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_clzl (unsigned long x) { CLZI(x) }
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#else
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int __builtin_clzl (unsigned long x) { CLZL(x) }
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#endif
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int __builtin_clzll (unsigned long long x) { CLZL(x) }
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/* Returns the number of trailing 0-bits in x, starting at the least
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significant bit position. If x is 0, the result is undefined. */
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int __builtin_ctz (unsigned int x) { CTZI(x) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_ctzl (unsigned long x) { CTZI(x) }
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#else
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int __builtin_ctzl (unsigned long x) { CTZL(x) }
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#endif
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int __builtin_ctzll (unsigned long long x) { CTZL(x) }
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/* Returns the number of leading redundant sign bits in x, i.e. the number
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of bits following the most significant bit that are identical to it.
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There are no special cases for 0 or other values. */
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int __builtin_clrsb (int x) { if (x < 0) x = ~x; x <<= 1; CLZI(x) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_clrsbl (long x) { if (x < 0) x = ~x; x <<= 1; CLZI(x) }
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#else
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int __builtin_clrsbl (long x) { if (x < 0) x = ~x; x <<= 1; CLZL(x) }
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#endif
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int __builtin_clrsbll (long long x) { if (x < 0) x = ~x; x <<= 1; CLZL(x) }
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/* Returns the number of 1-bits in x.*/
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int __builtin_popcount (unsigned int x) { POPCOUNTI(x, 0x3f) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_popcountl (unsigned long x) { POPCOUNTI(x, 0x3f) }
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#else
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int __builtin_popcountl (unsigned long x) { POPCOUNTL(x, 0x7f) }
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#endif
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int __builtin_popcountll (unsigned long long x) { POPCOUNTL(x, 0x7f) }
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/* Returns the parity of x, i.e. the number of 1-bits in x modulo 2. */
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int __builtin_parity (unsigned int x) { POPCOUNTI(x, 0x01) }
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#if __SIZEOF_LONG__ == 4
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int __builtin_parityl (unsigned long x) { POPCOUNTI(x, 0x01) }
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#else
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int __builtin_parityl (unsigned long x) { POPCOUNTL(x, 0x01) }
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#endif
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int __builtin_parityll (unsigned long long x) { POPCOUNTL(x, 0x01) }
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@ -3844,6 +3844,36 @@ int constant_p_var;
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int func(void);
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#if !defined _WIN32
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/* __builtin_clz and __builtin_ctz return random values for 0 */
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static void builtin_test_bits(unsigned long long x, int cnt[])
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{
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cnt[0] += __builtin_ffs(x);
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cnt[1] += __builtin_ffsl(x);
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cnt[2] += __builtin_ffsll(x);
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if ((unsigned int) x) cnt[3] += __builtin_clz(x);
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if ((unsigned long) x) cnt[4] += __builtin_clzl(x);
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if ((unsigned long long) x) cnt[5] += __builtin_clzll(x);
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if ((unsigned int) x) cnt[6] += __builtin_ctz(x);
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if ((unsigned long) x) cnt[7] += __builtin_ctzl(x);
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if ((unsigned long long) x) cnt[8] += __builtin_ctzll(x);
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cnt[9] += __builtin_clrsb(x);
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cnt[10] += __builtin_clrsbl(x);
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cnt[11] += __builtin_clrsbll(x);
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cnt[12] += __builtin_popcount(x);
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cnt[13] += __builtin_popcountl(x);
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cnt[14] += __builtin_popcountll(x);
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cnt[15] += __builtin_parity(x);
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cnt[16] += __builtin_parityl(x);
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cnt[17] += __builtin_parityll(x);
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}
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#endif
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void builtin_test(void)
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{
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short s;
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@ -3897,6 +3927,25 @@ void builtin_test(void)
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printf("bce: %d\n", i);
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//printf("bera: %p\n", __builtin_extract_return_addr((void*)43));
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#if !defined _WIN32
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{
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int cnt[18];
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unsigned long long r = 0;
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memset(cnt, 0, sizeof(cnt));
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builtin_test_bits(0, cnt);
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builtin_test_bits(0xffffffffffffffffull, cnt);
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for (i = 0; i < 64; i++)
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builtin_test_bits(1ull << i, cnt);
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for (i = 0; i < 1000; i++) {
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r = 0x5851f42d4c957f2dull * r + 0x14057b7ef767814full;
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builtin_test_bits(r, cnt);
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}
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for (i = 0; i < 18; i++)
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printf ("%d %d\n", i, cnt[i]);
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}
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#endif
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}
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#if defined _WIN32
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