fold-const.c (lshift_double, [...]): Handle shifting by 2 * HOST_BITS_PER_WIDE_INT correctly.
* fold-const.c (lshift_double, rshift_double): Handle shifting by 2 * HOST_BITS_PER_WIDE_INT correctly. From-SVN: r31289
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@ -1,3 +1,8 @@
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Sun Jan 9 01:02:55 EST 2000 John Wehle (john@feith.com)
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* fold-const.c (lshift_double, rshift_double): Handle
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shifting by 2 * HOST_BITS_PER_WIDE_INT correctly.
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2000-01-08 Alexandre Oliva <oliva@lsd.ic.unicamp.br>
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2000-01-08 Alexandre Oliva <oliva@lsd.ic.unicamp.br>
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* toplev.c (rest_of_compilation): Initialize cse_not_expected as
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* toplev.c (rest_of_compilation): Initialize cse_not_expected as
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@ -363,7 +363,14 @@ lshift_double (l1, h1, count, prec, lv, hv, arith)
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count %= prec;
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count %= prec;
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#endif
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#endif
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if (count >= HOST_BITS_PER_WIDE_INT)
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if (count >= 2 * HOST_BITS_PER_WIDE_INT)
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{
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/* Shifting by the host word size is undefined according to the
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ANSI standard, so we must handle this as a special case. */
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*hv = 0;
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*lv = 0;
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}
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else if (count >= HOST_BITS_PER_WIDE_INT)
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{
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{
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*hv = (unsigned HOST_WIDE_INT) l1 << (count - HOST_BITS_PER_WIDE_INT);
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*hv = (unsigned HOST_WIDE_INT) l1 << (count - HOST_BITS_PER_WIDE_INT);
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*lv = 0;
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*lv = 0;
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@ -398,7 +405,14 @@ rshift_double (l1, h1, count, prec, lv, hv, arith)
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count %= prec;
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count %= prec;
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#endif
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#endif
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if (count >= HOST_BITS_PER_WIDE_INT)
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if (count >= 2 * HOST_BITS_PER_WIDE_INT)
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{
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/* Shifting by the host word size is undefined according to the
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ANSI standard, so we must handle this as a special case. */
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*hv = signmask;
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*lv = signmask;
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}
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else if (count >= HOST_BITS_PER_WIDE_INT)
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{
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{
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*hv = signmask;
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*hv = signmask;
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*lv = ((signmask << (2 * HOST_BITS_PER_WIDE_INT - count - 1) << 1)
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*lv = ((signmask << (2 * HOST_BITS_PER_WIDE_INT - count - 1) << 1)
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