(make_extraction): When making a low part subreg of a reg,
use inner_mode, not is_mode. (num_sign_bit_copies): Inhibit x-1 special case when x is a paradoxical subreg. From-SVN: r2802
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@ -4632,8 +4632,8 @@ make_extraction (mode, inner, pos, pos_rtx, len,
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a SUBREG and it would sometimes return a new hard register. */
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new = gen_rtx (SUBREG, tmode, inner,
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(WORDS_BIG_ENDIAN
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&& GET_MODE_SIZE (is_mode) > UNITS_PER_WORD
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? ((GET_MODE_SIZE (is_mode) - GET_MODE_SIZE (tmode))
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&& GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD
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? ((GET_MODE_SIZE (inner_mode) - GET_MODE_SIZE (tmode))
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/ UNITS_PER_WORD)
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: 0));
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else
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@ -6345,7 +6345,12 @@ num_sign_bit_copies (x, mode)
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be such a carry. Furthermore, if the positive number is known to
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be 0 or 1, we know the result is either -1 or 0. */
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if (code == PLUS && XEXP (x, 1) == constm1_rtx)
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if (code == PLUS && XEXP (x, 1) == constm1_rtx
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/* Don't do this if XEXP (x, 0) is a paradoxical subreg
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because in principle we don't know what the high bits are. */
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&& !(GET_CODE (XEXP (x, 0)) == SUBREG
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&& (GET_MODE_SIZE (GET_MODE (XEXP (XEXP (x, 0), 0)))
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< GET_MODE_SIZE (GET_MODE (XEXP (x, 0))))))
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{
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sig = significant_bits (XEXP (x, 0), mode);
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if ((((HOST_WIDE_INT) 1 << (bitwidth - 1)) & sig) == 0)
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