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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [apps/] [testfloat/] [systmodes.c] - Rev 468
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/* =============================================================================== This C source file is part of TestFloat, Release 2a, a package of programs for testing the correctness of floating-point arithmetic complying to the IEC/IEEE Standard for Floating-Point. Written by John R. Hauser. More information is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/arithmetic/TestFloat.html'. THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. Derivative works are acceptable, even for commercial purposes, so long as (1) they include prominent notice that the work is derivative, and (2) they include prominent notice akin to these four paragraphs for those parts of this code that are retained. Modified for use with or1ksim's testsuite. Contributor Julius Baxter <julius.baxter@orsoc.se> =============================================================================== */ #include "milieu.h" #include "systmodes.h" #include "spr-defs.h" // Rounding modes as used by softfloat, we use them here to enum { float_round_nearest_even = 0, float_round_down = 1, float_round_up = 2, float_round_to_zero = 3 }; /* ------------------------------------------------------------------------------- Sets the system's IEC/IEEE floating-point rounding mode. Also disables all system exception traps. ------------------------------------------------------------------------------- */ void syst_float_set_rounding_mode( int8 roundingMode ) { // Read the FPCSR unsigned int spr = SPR_FPCSR; unsigned int value; // Read the SPR asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr)); // Clear the current rounding mode value &= ~SPR_FPCSR_RM; // Extract the flags from OR1K's FPCSR, put into testfloat's flags format switch(roundingMode) { case float_round_nearest_even: value |= FPCSR_RM_RN; break; case float_round_down: value |= FPCSR_RM_RIN; break; case float_round_up: value |= FPCSR_RM_RIP; break; case float_round_to_zero: value |= FPCSR_RM_RZ; break; default: //printf("%s: Unknown rounding mode: 0x%x\n",__FUNCTION__,roundingMode); // error! break; } // Disable FPEE - not anymore! //value &= ~SPR_FPCSR_FPEE; // Write value back to FPCSR asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value)); } /* ------------------------------------------------------------------------------- Sets the rounding precision of subsequent extended double-precision operations. The `precision' argument should be one of 0, 32, 64, or 80. If `precision' is 32, the rounding precision is set equivalent to single precision; else if `precision' is 64, the rounding precision is set equivalent to double precision; else the rounding precision is set to full extended double precision. ------------------------------------------------------------------------------- */ void syst_float_set_rounding_precision( int8 precision ) { //!!!code (possibly empty) // Yes empty for OR1K 32-bit implementation - have no choice of rounding // precision. return; }
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