48 lines
994 B
Plaintext
48 lines
994 B
Plaintext
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/* MIPS table for ACK target optimizer */
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MAXOP 5;
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LABEL_STARTER '.';
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%%;
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X, Y, Z { TRUE };
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R { TRUE };
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%%;
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/* Whitespace is significant here! */
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addiu R, R, X : addiu R, R, Y { plus(X, Y, Z) } -> addiu R, R, Z ;
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addiu X, X, 0 -> ;
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b X : nop : labdef X -> labdef X ;
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%%;
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/* Does it fit a signed 16-bit integer? */
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static int fits16(long l) {
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return l >= -32768 && l <= 32767;
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}
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/* Tries sum = a + b with signed 16-bit integers. */
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int plus(const char *a, const char *b, const char *sum)
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{
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long la, lb, lsum;
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char *end;
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la = strtol(a, &end, 10);
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if (*a == '\0' || *end != '\0' || !fits16(la))
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return 0;
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lb = strtol(b, &end, 10);
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if (*b == '\0' || *end != '\0' || !fits16(lb))
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return 0;
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lsum = la + lb;
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if (!fits16(lsum))
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return 0;
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snprintf(sum, 7, "%ld", lsum);
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return 1;
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}
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