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(store_bit_field): If VALUE needs to be narrowed, do

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it with gen_lowpart, not an explicit SUBREG.

From-SVN: r2920
This commit is contained in:
Richard Stallman 1992-12-27 03:55:29 +00:00
parent 66212c2f76
commit f5df292efc
1 changed files with 10 additions and 4 deletions
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14
gcc/expmed.c
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@ -402,12 +402,18 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, align, total_size)
if (GET_MODE_BITSIZE (GET_MODE (value)) >= bitsize)
{
/* Optimization: Don't bother really extending VALUE
if it has all the bits we will actually use. */
if it has all the bits we will actually use. However,
if we must narrow it, be sure we do it correctly. */
/* Avoid making subreg of a subreg, or of a mem. */
if (GET_CODE (value1) != REG)
if (GET_MODE_SIZE (GET_MODE (value)) < GET_MODE_SIZE (maxmode))
{
/* Avoid making subreg of a subreg, or of a mem. */
if (GET_CODE (value1) != REG)
value1 = copy_to_reg (value1);
value1 = gen_rtx (SUBREG, maxmode, value1, 0);
value1 = gen_rtx (SUBREG, maxmode, value1, 0);
}
else
value1 = gen_lowpart (maxmode, value1);
}
else if (!CONSTANT_P (value))
/* Parse phase is supposed to make VALUE's data type