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239 lines
6.3 KiB
239 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Linux/PA-RISC Project (http://www.parisc-linux.org/) |
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* |
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* Floating-point emulation code |
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* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <[email protected]> |
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*/ |
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/* |
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* BEGIN_DESC |
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* |
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* Purpose: |
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* Single Floating-point Round to Integer |
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* Double Floating-point Round to Integer |
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* Quad Floating-point Round to Integer (returns unimplemented) |
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* |
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* External Interfaces: |
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* dbl_frnd(srcptr,nullptr,dstptr,status) |
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* sgl_frnd(srcptr,nullptr,dstptr,status) |
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* |
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* END_DESC |
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*/ |
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#include "float.h" |
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#include "sgl_float.h" |
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#include "dbl_float.h" |
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#include "cnv_float.h" |
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/* |
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* Single Floating-point Round to Integer |
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*/ |
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/*ARGSUSED*/ |
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int |
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sgl_frnd(sgl_floating_point *srcptr, |
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unsigned int *nullptr, |
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sgl_floating_point *dstptr, |
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unsigned int *status) |
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{ |
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register unsigned int src, result; |
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register int src_exponent; |
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register boolean inexact = FALSE; |
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src = *srcptr; |
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/* |
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* check source operand for NaN or infinity |
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*/ |
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if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) { |
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/* |
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* is signaling NaN? |
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*/ |
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if (Sgl_isone_signaling(src)) { |
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/* trap if INVALIDTRAP enabled */ |
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); |
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/* make NaN quiet */ |
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Set_invalidflag(); |
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Sgl_set_quiet(src); |
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} |
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/* |
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* return quiet NaN or infinity |
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*/ |
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*dstptr = src; |
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return(NOEXCEPTION); |
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} |
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/* |
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* Need to round? |
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*/ |
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if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) { |
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*dstptr = src; |
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return(NOEXCEPTION); |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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Sgl_clear_exponent_set_hidden(src); |
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result = src; |
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Sgl_rightshift(result,(SGL_P-1) - (src_exponent)); |
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/* check for inexact */ |
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if (Sgl_isinexact_to_fix(src,src_exponent)) { |
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inexact = TRUE; |
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/* round result */ |
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switch (Rounding_mode()) { |
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case ROUNDPLUS: |
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if (Sgl_iszero_sign(src)) Sgl_increment(result); |
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break; |
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case ROUNDMINUS: |
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if (Sgl_isone_sign(src)) Sgl_increment(result); |
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break; |
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case ROUNDNEAREST: |
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if (Sgl_isone_roundbit(src,src_exponent)) |
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if (Sgl_isone_stickybit(src,src_exponent) |
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|| (Sgl_isone_lowmantissa(result))) |
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Sgl_increment(result); |
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} |
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} |
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Sgl_leftshift(result,(SGL_P-1) - (src_exponent)); |
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if (Sgl_isone_hiddenoverflow(result)) |
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Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1)); |
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else Sgl_set_exponent(result,src_exponent + SGL_BIAS); |
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} |
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else { |
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result = src; /* set sign */ |
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Sgl_setzero_exponentmantissa(result); |
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/* check for inexact */ |
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if (Sgl_isnotzero_exponentmantissa(src)) { |
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inexact = TRUE; |
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/* round result */ |
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switch (Rounding_mode()) { |
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case ROUNDPLUS: |
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if (Sgl_iszero_sign(src)) |
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Sgl_set_exponent(result,SGL_BIAS); |
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break; |
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case ROUNDMINUS: |
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if (Sgl_isone_sign(src)) |
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Sgl_set_exponent(result,SGL_BIAS); |
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break; |
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case ROUNDNEAREST: |
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if (src_exponent == -1) |
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if (Sgl_isnotzero_mantissa(src)) |
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Sgl_set_exponent(result,SGL_BIAS); |
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} |
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} |
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} |
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*dstptr = result; |
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if (inexact) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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return(NOEXCEPTION); |
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} |
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/* |
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* Double Floating-point Round to Integer |
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*/ |
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/*ARGSUSED*/ |
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int |
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dbl_frnd( |
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dbl_floating_point *srcptr, |
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unsigned int *nullptr, |
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dbl_floating_point *dstptr, |
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unsigned int *status) |
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{ |
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register unsigned int srcp1, srcp2, resultp1, resultp2; |
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register int src_exponent; |
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register boolean inexact = FALSE; |
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Dbl_copyfromptr(srcptr,srcp1,srcp2); |
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/* |
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* check source operand for NaN or infinity |
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*/ |
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if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) { |
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/* |
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* is signaling NaN? |
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*/ |
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if (Dbl_isone_signaling(srcp1)) { |
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/* trap if INVALIDTRAP enabled */ |
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); |
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/* make NaN quiet */ |
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Set_invalidflag(); |
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Dbl_set_quiet(srcp1); |
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} |
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/* |
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* return quiet NaN or infinity |
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*/ |
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Dbl_copytoptr(srcp1,srcp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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/* |
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* Need to round? |
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*/ |
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if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) { |
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Dbl_copytoptr(srcp1,srcp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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Dbl_clear_exponent_set_hidden(srcp1); |
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resultp1 = srcp1; |
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resultp2 = srcp2; |
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Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); |
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/* check for inexact */ |
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if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { |
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inexact = TRUE; |
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/* round result */ |
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switch (Rounding_mode()) { |
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case ROUNDPLUS: |
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if (Dbl_iszero_sign(srcp1)) |
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Dbl_increment(resultp1,resultp2); |
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break; |
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case ROUNDMINUS: |
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if (Dbl_isone_sign(srcp1)) |
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Dbl_increment(resultp1,resultp2); |
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break; |
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case ROUNDNEAREST: |
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if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) |
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if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) |
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|| (Dbl_isone_lowmantissap2(resultp2))) |
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Dbl_increment(resultp1,resultp2); |
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} |
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} |
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Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); |
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if (Dbl_isone_hiddenoverflow(resultp1)) |
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Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1)); |
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else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS); |
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} |
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else { |
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resultp1 = srcp1; /* set sign */ |
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Dbl_setzero_exponentmantissa(resultp1,resultp2); |
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/* check for inexact */ |
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if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { |
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inexact = TRUE; |
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/* round result */ |
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switch (Rounding_mode()) { |
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case ROUNDPLUS: |
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if (Dbl_iszero_sign(srcp1)) |
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Dbl_set_exponent(resultp1,DBL_BIAS); |
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break; |
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case ROUNDMINUS: |
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if (Dbl_isone_sign(srcp1)) |
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Dbl_set_exponent(resultp1,DBL_BIAS); |
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break; |
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case ROUNDNEAREST: |
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if (src_exponent == -1) |
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if (Dbl_isnotzero_mantissa(srcp1,srcp2)) |
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Dbl_set_exponent(resultp1,DBL_BIAS); |
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} |
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} |
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} |
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Dbl_copytoptr(resultp1,resultp2,dstptr); |
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if (inexact) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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return(NOEXCEPTION); |
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}
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