diff options
Diffstat (limited to 'compiler-rt/lib/builtins/floatsidf.c')
| -rw-r--r-- | compiler-rt/lib/builtins/floatsidf.c | 63 |
1 files changed, 30 insertions, 33 deletions
diff --git a/compiler-rt/lib/builtins/floatsidf.c b/compiler-rt/lib/builtins/floatsidf.c index 56ba903a6a2..ee4f05b8b10 100644 --- a/compiler-rt/lib/builtins/floatsidf.c +++ b/compiler-rt/lib/builtins/floatsidf.c @@ -17,43 +17,40 @@ #include "int_lib.h" -COMPILER_RT_ABI fp_t -__floatsidf(int a) { - - const int aWidth = sizeof a * CHAR_BIT; - - // Handle zero as a special case to protect clz - if (a == 0) - return fromRep(0); - - // All other cases begin by extracting the sign and absolute value of a - rep_t sign = 0; - if (a < 0) { - sign = signBit; - a = -a; - } - - // Exponent of (fp_t)a is the width of abs(a). - const int exponent = (aWidth - 1) - __builtin_clz(a); - rep_t result; - - // Shift a into the significand field and clear the implicit bit. Extra - // cast to unsigned int is necessary to get the correct behavior for - // the input INT_MIN. - const int shift = significandBits - exponent; - result = (rep_t)(unsigned int)a << shift ^ implicitBit; - - // Insert the exponent - result += (rep_t)(exponent + exponentBias) << significandBits; - // Insert the sign bit and return - return fromRep(result | sign); +COMPILER_RT_ABI fp_t __floatsidf(int a) { + + const int aWidth = sizeof a * CHAR_BIT; + + // Handle zero as a special case to protect clz + if (a == 0) + return fromRep(0); + + // All other cases begin by extracting the sign and absolute value of a + rep_t sign = 0; + if (a < 0) { + sign = signBit; + a = -a; + } + + // Exponent of (fp_t)a is the width of abs(a). + const int exponent = (aWidth - 1) - __builtin_clz(a); + rep_t result; + + // Shift a into the significand field and clear the implicit bit. Extra + // cast to unsigned int is necessary to get the correct behavior for + // the input INT_MIN. + const int shift = significandBits - exponent; + result = (rep_t)(unsigned int)a << shift ^ implicitBit; + + // Insert the exponent + result += (rep_t)(exponent + exponentBias) << significandBits; + // Insert the sign bit and return + return fromRep(result | sign); } #if defined(__ARM_EABI__) #if defined(COMPILER_RT_ARMHF_TARGET) -AEABI_RTABI fp_t __aeabi_i2d(int a) { - return __floatsidf(a); -} +AEABI_RTABI fp_t __aeabi_i2d(int a) { return __floatsidf(a); } #else AEABI_RTABI fp_t __aeabi_i2d(int a) COMPILER_RT_ALIAS(__floatsidf); #endif |

