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https://github.com/openhwgroup/cvw
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92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
// softfloat_demo3.c
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// james.stine@okstate.edu 15 August 2023
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//
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// Demonstrate using SoftFloat do compute a floating-point for quad, then print results
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#include <stdio.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <quadmath.h> // GCC Quad-Math Library
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#include "softfloat.h"
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#include "softfloat_types.h"
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typedef union sp {
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uint32_t v;
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float f;
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} sp;
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typedef union dp {
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uint64_t v;
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double d;
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} dp;
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typedef union qp {
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uint64_t v[2];
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__float128 q;
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} qp;
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void printF32 (char *msg, float32_t f) {
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sp conv;
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int i, j;
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conv.v = f.v; // use union to convert between hexadecimal and floating-point views
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printf("%s: ", msg); // print out nicely
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printf("0x%04x_%04x = %g\n", (conv.v >> 16),(conv.v & 0xFFFF), conv.f);
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}
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void printF64 (char *msg, float64_t d) {
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dp conv;
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int i, j;
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conv.v = d.v; // use union to convert between hexadecimal and floating-point views
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printf("%s: ", msg); // print out nicely
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printf("0x%08lx_%08lx = %g\n", (conv.v >> 32),(conv.v & 0xFFFFFFFF), conv.d);
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}
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void printF128 (char *msg, float128_t q) {
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qp conv;
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int i, j;
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char buf[64];
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conv.v[0] = q.v[0]; // use union to convert between hexadecimal and floating-point views
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conv.v[1] = q.v[1]; // use union to convert between hexadecimal and floating-point views
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printf("%s: ", msg); // print out nicely
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//printf("0x%016" PRIx64 "_%016" PRIx64 " = %1.15Qe\n", q.v[1], q.v[0], conv.q);
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quadmath_snprintf (buf, sizeof buf, "%1.15Qe", conv.q);
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printf("0x%016" PRIx64 "_%016" PRIx64 " = %s\n", q.v[1], q.v[0], buf);
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}
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void printFlags(void) {
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int NX = softfloat_exceptionFlags % 2;
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int UF = (softfloat_exceptionFlags >> 1) % 2;
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int OF = (softfloat_exceptionFlags >> 2) % 2;
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int DZ = (softfloat_exceptionFlags >> 3) % 2;
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int NV = (softfloat_exceptionFlags >> 4) % 2;
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printf ("Flags: Inexact %d Underflow %d Overflow %d DivideZero %d Invalid %d\n",
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NX, UF, OF, DZ, NV);
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}
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void softfloatInit(void) {
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// rounding modes: RNE: softfloat_round_near_even
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// RZ: softfloat_round_minMag
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// RP: softfloat_round_max
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// RM: softfloat_round_min
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softfloat_roundingMode = softfloat_round_near_even;
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softfloat_exceptionFlags = 0; // clear exceptions
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softfloat_detectTininess = softfloat_tininess_afterRounding; // RISC-V behavior for tininess
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}
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int main() {
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float64_t x, y, z;
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float64_t r;
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x.v = 0xBFFF988ECE97DFEB;
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y.v = 0x3F8EFFFFFFFFFFFF;
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z.v = 0x4001000000000000;
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softfloatInit();
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printF64("X", x); printF64("Y", y); printF64("Z", z);
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r = f64_mulAdd(x, y, z);
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printf("\n");
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printF64("r", r);
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}
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