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(gen_lowpart_for_combine): Allow MODE to be wider than a word in

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restricted circumstances.

From-SVN: r2914
This commit is contained in:
Richard Kenner 1992-12-26 18:11:20 -05:00
parent bc957254f8
commit eae957a8b8
1 changed files with 8 additions and 1 deletions
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9
gcc/combine.c
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@ -7416,7 +7416,14 @@ gen_lowpart_for_combine (mode, x)
if (GET_MODE (x) == mode) if (GET_MODE (x) == mode)
return x; return x;
if (GET_MODE_SIZE (mode) > UNITS_PER_WORD) /* We can only support MODE being wider than a word if X is a
constant integer or has a mode the same size. */
if (GET_MODE_SIZE (mode) > UNITS_PER_WORD
&& ! ((GET_MODE (x) == VOIDmode
&& (GET_CODE (x) == CONST_INT
|| GET_CODE (x) == CONST_DOUBLE))
|| GET_MODE_SIZE (GET_MODE (x)) == GET_MODE_SIZE (mode)))
return gen_rtx (CLOBBER, GET_MODE (x), const0_rtx); return gen_rtx (CLOBBER, GET_MODE (x), const0_rtx);
/* X might be a paradoxical (subreg (mem)). In that case, gen_lowpart /* X might be a paradoxical (subreg (mem)). In that case, gen_lowpart