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(make_compound_operation...

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(make_compound_operation, case ASHIFTRT): Add new code to
handle (ashiftrt (neg (ashift FOO C1) C2)) just like we currently
handle (ashiftrt (OP (ashiftrt FOO C1) C2) C2).

From-SVN: r2028
This commit is contained in:
Richard Kenner
1992-09-02 06:37:38 -04:00
parent 11f6a29c9f
commit d0dcc580cf
1 changed files with 13 additions and 0 deletions
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13
gcc/combine.c
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@@ -4652,6 +4652,19 @@ make_compound_operation (x, in_code)
code == LSHIFTRT, 0, in_code == COMPARE);
}
/* Similarly for (ashiftrt (neg (ashift FOO C1)) C2). */
if (GET_CODE (XEXP (x, 1)) == CONST_INT
&& GET_CODE (XEXP (x, 0)) == NEG
&& GET_CODE (XEXP (XEXP (x, 0), 0)) == ASHIFT
&& GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 1)) == CONST_INT
&& INTVAL (XEXP (x, 1)) >= INTVAL (XEXP (XEXP (XEXP (x, 0), 0), 1)))
new = make_extraction (mode,
gen_unary (GET_CODE (XEXP (x, 0)), mode,
XEXP (XEXP (XEXP (x, 0), 0), 0)),
(INTVAL (XEXP (x, 1))
- INTVAL (XEXP (XEXP (XEXP (x, 0), 0), 1))),
NULL_RTX, mode_width - INTVAL (XEXP (x, 1)),
code == LSHIFTRT, 0, in_code == COMPARE);
break;
}