diff options
| author | Kenneth Zadeck <zadeck@naturalbridge.com> | 2013-04-03 20:24:07 +0000 |
|---|---|---|
| committer | Kenneth Zadeck <zadeck@gcc.gnu.org> | 2013-04-03 20:24:07 +0000 |
| commit | 5e0919f1eecbb00fdcf16ff7e064be122fd0bbfc (patch) | |
| tree | 98ffd8bc9a37f3b09621b894c7db0addd5423458 /gcc/hwint.c | |
| parent | be672e08bbe0d9f210285ec6f3eccf4ff0469d0e (diff) | |
hwint.c (sext_hwi, zext_hwi): New functions.
2013-04-03 Kenneth Zadeck <zadeck@naturalbridge.com>
* hwint.c (sext_hwi, zext_hwi): New functions.
* hwint.h (HOST_BITS_PER_HALF_WIDE_INT, HOST_HALF_WIDE_INT,
HOST_HALF_WIDE_INT_PRINT, HOST_HALF_WIDE_INT_PRINT_C,
HOST_HALF_WIDE_INT_PRINT_DEC, HOST_HALF_WIDE_INT_PRINT_DEC_C,
HOST_HALF_WIDE_INT_PRINT_UNSIGNED, HOST_HALF_WIDE_INT_PRINT_HEX,
HOST_HALF_WIDE_INT_PRINT_HEX_PURE): New symbols.
(sext_hwi, zext_hwi): New functions.
From-SVN: r197456
Diffstat (limited to 'gcc/hwint.c')
| -rw-r--r-- | gcc/hwint.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/gcc/hwint.c b/gcc/hwint.c index 330b42c68e7..134fe1da2cc 100644 --- a/gcc/hwint.c +++ b/gcc/hwint.c @@ -204,3 +204,35 @@ least_common_multiple (HOST_WIDE_INT a, HOST_WIDE_INT b) { return mul_hwi (abs_hwi (a) / gcd (a, b), abs_hwi (b)); } + +#ifdef ENABLE_CHECKING +/* Sign extend SRC starting from PREC. */ + +HOST_WIDE_INT +sext_hwi (HOST_WIDE_INT src, unsigned int prec) +{ + gcc_checking_assert (prec <= HOST_BITS_PER_WIDE_INT); + + if (prec == HOST_BITS_PER_WIDE_INT) + return src; + else + { + int shift = HOST_BITS_PER_WIDE_INT - prec; + return (src << shift) >> shift; + } +} + +/* Zero extend SRC starting from PREC. */ + +unsigned HOST_WIDE_INT +zext_hwi (unsigned HOST_WIDE_INT src, unsigned int prec) +{ + gcc_checking_assert (prec <= HOST_BITS_PER_WIDE_INT); + + if (prec == HOST_BITS_PER_WIDE_INT) + return src; + else + return src & (((HOST_WIDE_INT)1 << prec) - 1); +} + +#endif |