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34b9cc076f
The fxam implementation does not check for invalid encodings, instead treating them like NaN or normal numbers depending on the exponent. Fix it to check that the high bit of the significand is set before treating an encoding as NaN or normal, thus resulting in correct handling (all of C0, C2 and C3 cleared) for invalid encodings. Signed-off-by: Joseph Myers <joseph@codesourcery.com> Message-Id: <alpine.DEB.2.21.2005132349311.11687@digraph.polyomino.org.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/* Test fxam 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 union u ld_pseudo_m16382 = { .s = { UINT64_C(1) << 63, 0 } };
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volatile union u ld_pseudo_nm16382 = { .s = { UINT64_C(1) << 63, 0x8000 } };
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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 union u ld_invalid_n1 = { .s = { 1, 0x8123 } };
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volatile union u ld_invalid_n2 = { .s = { 0, 0x8123 } };
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volatile union u ld_invalid_n3 = { .s = { 0, 0xffff } };
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volatile union u ld_invalid_n4 = { .s = { (UINT64_C(1) << 63) - 1, 0xffff } };
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#define C0 (1 << 8)
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#define C1 (1 << 9)
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#define C2 (1 << 10)
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#define C3 (1 << 14)
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#define FLAGS (C0 | C1 | C2 | C3)
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int main(void)
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{
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short sw;
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int ret = 0;
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (0.0L));
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if ((sw & FLAGS) != C3) {
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printf("FAIL: +0\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-0.0L));
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if ((sw & FLAGS) != (C3 | C1)) {
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printf("FAIL: -0\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (1.0L));
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if ((sw & FLAGS) != C2) {
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printf("FAIL: +normal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-1.0L));
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if ((sw & FLAGS) != (C2 | C1)) {
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printf("FAIL: -normal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (__builtin_infl()));
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if ((sw & FLAGS) != (C2 | C0)) {
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printf("FAIL: +inf\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-__builtin_infl()));
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if ((sw & FLAGS) != (C2 | C1 | C0)) {
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printf("FAIL: -inf\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (__builtin_nanl("")));
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if ((sw & FLAGS) != C0) {
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printf("FAIL: +nan\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-__builtin_nanl("")));
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if ((sw & FLAGS) != (C1 | C0)) {
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printf("FAIL: -nan\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (__builtin_nansl("")));
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if ((sw & FLAGS) != C0) {
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printf("FAIL: +snan\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-__builtin_nansl("")));
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if ((sw & FLAGS) != (C1 | C0)) {
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printf("FAIL: -snan\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (0x1p-16445L));
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if ((sw & FLAGS) != (C3 | C2)) {
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printf("FAIL: +denormal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (-0x1p-16445L));
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if ((sw & FLAGS) != (C3 | C2 | C1)) {
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printf("FAIL: -denormal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_pseudo_m16382.ld));
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if ((sw & FLAGS) != (C3 | C2)) {
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printf("FAIL: +pseudo-denormal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_pseudo_nm16382.ld));
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if ((sw & FLAGS) != (C3 | C2 | C1)) {
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printf("FAIL: -pseudo-denormal\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_1.ld));
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if ((sw & FLAGS) != 0) {
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printf("FAIL: +invalid 1\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_n1.ld));
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if ((sw & FLAGS) != C1) {
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printf("FAIL: -invalid 1\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_2.ld));
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if ((sw & FLAGS) != 0) {
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printf("FAIL: +invalid 2\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_n2.ld));
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if ((sw & FLAGS) != C1) {
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printf("FAIL: -invalid 2\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_3.ld));
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if ((sw & FLAGS) != 0) {
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printf("FAIL: +invalid 3\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_n3.ld));
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if ((sw & FLAGS) != C1) {
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printf("FAIL: -invalid 3\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_4.ld));
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if ((sw & FLAGS) != 0) {
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printf("FAIL: +invalid 4\n");
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ret = 1;
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}
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__asm__ volatile ("fxam\nfnstsw" : "=a" (sw) : "t" (ld_invalid_n4.ld));
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if ((sw & FLAGS) != C1) {
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printf("FAIL: -invalid 4\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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