108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* Test fscale instruction. */
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#include <stdint.h>
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#include <stdio.h>
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union u {
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struct { uint64_t sig; uint16_t sign_exp; } s;
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long double ld;
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};
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volatile long double ld_third = 1.0L / 3.0L;
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volatile long double ld_four_thirds = 4.0L / 3.0L;
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volatile union u ld_invalid_1 = { .s = { 1, 1234 } };
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volatile union u ld_invalid_2 = { .s = { 0, 1234 } };
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volatile union u ld_invalid_3 = { .s = { 0, 0x7fff } };
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volatile union u ld_invalid_4 = { .s = { (UINT64_C(1) << 63) - 1, 0x7fff } };
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volatile long double ld_res;
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int isnan_ld(long double x)
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{
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union u tmp = { .ld = x };
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return ((tmp.s.sign_exp & 0x7fff) == 0x7fff &&
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(tmp.s.sig >> 63) != 0 &&
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(tmp.s.sig << 1) != 0);
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}
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int issignaling_ld(long double x)
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{
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union u tmp = { .ld = x };
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return isnan_ld(x) && (tmp.s.sig & UINT64_C(0x4000000000000000)) == 0;
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}
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int main(void)
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{
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short cw;
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int ret = 0;
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (2.5L), "u" (__builtin_nansl("")));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale snan\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (2.5L), "u" (ld_invalid_1.ld));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale invalid 1\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (2.5L), "u" (ld_invalid_2.ld));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale invalid 2\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (2.5L), "u" (ld_invalid_3.ld));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale invalid 3\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (2.5L), "u" (ld_invalid_4.ld));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale invalid 4\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (0.0L), "u" (__builtin_infl()));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale 0 up inf\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (__builtin_infl()), "u" (-__builtin_infl()));
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if (!isnan_ld(ld_res) || issignaling_ld(ld_res)) {
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printf("FAIL: fscale inf down inf\n");
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ret = 1;
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}
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/* Set round-downward. */
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__asm__ volatile ("fnstcw %0" : "=m" (cw));
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cw = (cw & ~0xc00) | 0x400;
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__asm__ volatile ("fldcw %0" : : "m" (cw));
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (1.0L), "u" (__builtin_infl()));
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if (ld_res != __builtin_infl()) {
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printf("FAIL: fscale finite up inf\n");
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ret = 1;
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}
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (-1.0L), "u" (-__builtin_infl()));
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if (ld_res != -0.0L || __builtin_copysignl(1.0L, ld_res) != -1.0L) {
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printf("FAIL: fscale finite down inf\n");
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ret = 1;
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}
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/* Set round-to-nearest with single-precision rounding. */
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cw = cw & ~0xf00;
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__asm__ volatile ("fldcw %0" : : "m" (cw));
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__asm__ volatile ("fscale" : "=t" (ld_res) :
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"0" (ld_third), "u" (2.0L));
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cw = cw | 0x300;
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__asm__ volatile ("fldcw %0" : : "m" (cw));
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if (ld_res != ld_four_thirds) {
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printf("FAIL: fscale single-precision\n");
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ret = 1;
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}
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return ret;
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}
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