From 37a6a455466e5b197311771a777ab241e471ed8a Mon Sep 17 00:00:00 2001 From: Edward O'Callaghan Date: Fri, 7 Aug 2009 20:30:09 +0000 Subject: Code style and Readability fixes. Credit to Craig van Vliet. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@78403 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/floatdidf.c | 85 ++++++++++++++++++++++++++++++--------------------------- 1 file changed, 45 insertions(+), 40 deletions(-) (limited to 'lib/floatdidf.c') diff --git a/lib/floatdidf.c b/lib/floatdidf.c index f76d1b899..a0f501b60 100644 --- a/lib/floatdidf.c +++ b/lib/floatdidf.c @@ -1,29 +1,32 @@ -//===-- floatdidf.c - Implement __floatdidf -------------------------------===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file implements __floatdidf for the compiler_rt library. -// -//===----------------------------------------------------------------------===// +/*===-- floatdidf.c - Implement __floatdidf -------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + *===----------------------------------------------------------------------=== + * + * This file implements __floatdidf for the compiler_rt library. + * + *===----------------------------------------------------------------------=== + */ #include "int_lib.h" #include -// Returns: convert a to a double, rounding toward even. +/* Returns: convert a to a double, rounding toward even. */ -// Assumption: double is a IEEE 64 bit floating point type -// di_int is a 64 bit integral type +/* Assumption: double is a IEEE 64 bit floating point type + * di_int is a 64 bit integral type + */ -// seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm +/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ #ifndef __SOFT_FP__ -// Support for systems that have hardware floating-point; we'll set the inexact flag -// as a side-effect of this computation. +/* Support for systems that have hardware floating-point; we'll set the inexact flag + * as a side-effect of this computation. + */ #include double @@ -42,8 +45,9 @@ __floatdidf(di_int a) } #else -// Support for systems that don't have hardware floating-point; there are no flags to -// set, and we don't want to code-gen to an unknown soft-float implementation. +/* Support for systems that don't have hardware floating-point; there are no flags to + * set, and we don't want to code-gen to an unknown soft-float implementation. + */ double __floatdidf(di_int a) @@ -53,17 +57,18 @@ __floatdidf(di_int a) const unsigned N = sizeof(di_int) * CHAR_BIT; const di_int s = a >> (N-1); a = (a ^ s) - s; - int sd = N - __builtin_clzll(a); // number of significant digits - int e = sd - 1; // exponent + int sd = N - __builtin_clzll(a); /* number of significant digits */ + int e = sd - 1; /* exponent */ if (sd > DBL_MANT_DIG) { - // start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx - // finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR - // 12345678901234567890123456 - // 1 = msb 1 bit - // P = bit DBL_MANT_DIG-1 bits to the right of 1 - // Q = bit DBL_MANT_DIG bits to the right of 1 - // R = "or" of all bits to the right of Q + /* start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx + * finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR + * 12345678901234567890123456 + * 1 = msb 1 bit + * P = bit DBL_MANT_DIG-1 bits to the right of 1 + * Q = bit DBL_MANT_DIG bits to the right of 1 + * R = "or" of all bits to the right of Q + */ switch (sd) { case DBL_MANT_DIG + 1: @@ -75,28 +80,28 @@ __floatdidf(di_int a) a = ((du_int)a >> (sd - (DBL_MANT_DIG+2))) | ((a & ((du_int)(-1) >> ((N + DBL_MANT_DIG+2) - sd))) != 0); }; - // finish: - a |= (a & 4) != 0; // Or P into R - ++a; // round - this step may add a significant bit - a >>= 2; // dump Q and R - // a is now rounded to DBL_MANT_DIG or DBL_MANT_DIG+1 bits + /* finish: */ + a |= (a & 4) != 0; /* Or P into R */ + ++a; /* round - this step may add a significant bit */ + a >>= 2; /* dump Q and R */ + /* a is now rounded to DBL_MANT_DIG or DBL_MANT_DIG+1 bits */ if (a & ((du_int)1 << DBL_MANT_DIG)) { a >>= 1; ++e; } - // a is now rounded to DBL_MANT_DIG bits + /* a is now rounded to DBL_MANT_DIG bits */ } else { a <<= (DBL_MANT_DIG - sd); - // a is now rounded to DBL_MANT_DIG bits + /* a is now rounded to DBL_MANT_DIG bits */ } double_bits fb; - fb.u.high = ((su_int)s & 0x80000000) | // sign - ((e + 1023) << 20) | // exponent - ((su_int)(a >> 32) & 0x000FFFFF); // mantissa-high - fb.u.low = (su_int)a; // mantissa-low + fb.u.high = ((su_int)s & 0x80000000) | /* sign */ + ((e + 1023) << 20) | /* exponent */ + ((su_int)(a >> 32) & 0x000FFFFF); /* mantissa-high */ + fb.u.low = (su_int)a; /* mantissa-low */ return fb.f; } #endif -- cgit v1.2.3