39 lines
948 B
C
39 lines
948 B
C
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/* Test pseudo-denormal operations. */
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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 union u ld_pseudo_m16382 = { .s = { UINT64_C(1) << 63, 0 } };
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volatile long double ld_res;
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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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ld_res = ld_pseudo_m16382.ld + ld_pseudo_m16382.ld;
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if (ld_res != 0x1p-16381L) {
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printf("FAIL: pseudo-denormal add\n");
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ret = 1;
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}
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if (ld_pseudo_m16382.ld != 0x1p-16382L) {
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printf("FAIL: pseudo-denormal compare\n");
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ret = 1;
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}
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/* Set round-upward. */
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__asm__ volatile ("fnstcw %0" : "=m" (cw));
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cw = (cw & ~0xc00) | 0x800;
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__asm__ volatile ("fldcw %0" : : "m" (cw));
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__asm__ ("frndint" : "=t" (ld_res) : "0" (ld_pseudo_m16382.ld));
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if (ld_res != 1.0L) {
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printf("FAIL: pseudo-denormal round-to-integer\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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