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(fold_rtx): For SUBREG, actually test subreg_lowpart_p in the code to handle narrowing subregs. 

(fold_rtx): For SUBREG, actually test subreg_lowpart_p in the
code to handle narrowing subregs.  And exclude binary ops like DIV
where truncating the args is not valid.

From-SVN: r2160
This commit is contained in:
Richard Stallman 1992-09-19 04:48:37 +00:00
parent f0c70ef08a
commit e8d76a395e
1 changed files with 8 additions and 1 deletions
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9
gcc/cse.c
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@ -4457,7 +4457,8 @@ fold_rtx (x, insn)
can use the inner value. */
if (GET_CODE (folded_arg0) == REG
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (folded_arg0)))
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (folded_arg0))
&& subreg_lowpart_p (x))
{
struct table_elt *elt;
@ -4472,6 +4473,8 @@ fold_rtx (x, insn)
for (; elt; elt = elt->next_same_value)
{
enum rtx_code eltcode = GET_CODE (elt->exp);
/* Just check for unary and binary operations. */
if (GET_RTX_CLASS (GET_CODE (elt->exp)) == '1'
&& GET_CODE (elt->exp) != SIGN_EXTEND
@ -4491,6 +4494,10 @@ fold_rtx (x, insn)
}
else if ((GET_RTX_CLASS (GET_CODE (elt->exp)) == '2'
|| GET_RTX_CLASS (GET_CODE (elt->exp)) == 'c')
&& eltcode != DIV && eltcode != MOD
&& eltcode != UDIV && eltcode != UMOD
&& eltcode != ASHIFTRT && eltcode != LSHIFTRT
&& eltcode != ROTATE && eltcode != ROTATERT
&& ((GET_CODE (XEXP (elt->exp, 0)) == SUBREG
&& (GET_MODE (SUBREG_REG (XEXP (elt->exp, 0)))
== mode))