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(rtx_equal_for_tmemref_p): Commutative operations are identical if the 

operands match in the opposite order.

From-SVN: r6732
This commit is contained in:
Richard Kenner 1994-03-09 15:31:49 -05:00
parent 413c72c289
commit 7a3b13d103
1 changed files with 14 additions and 1 deletions
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15
gcc/sched.c
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@ -1,5 +1,5 @@
/* Instruction scheduling pass.
Copyright (C) 1992, 1993 Free Software Foundation, Inc.
Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com)
Enhanced by, and currently maintained by, Jim Wilson (wilson@cygnus.com)
@ -481,6 +481,19 @@ rtx_equal_for_memref_p (x, y)
if (code == SYMBOL_REF)
return XSTR (x, 0) == XSTR (y, 0);
/* For commutative operations, the RTX match if the operand match in any
order. Also handle the simple binary and unary cases without a loop. */
if (code == EQ || code == NE || GET_RTX_CLASS (code) == 'c')
return ((rtx_equal_for_memref_p (XEXP (x, 0), XEXP (y, 0))
&& rtx_equal_for_memref_p (XEXP (x, 1), XEXP (y, 1)))
|| (rtx_equal_for_memref_p (XEXP (x, 0), XEXP (y, 1))
&& rtx_equal_for_memref_p (XEXP (x, 1), XEXP (y, 0))));
else if (GET_RTX_CLASS (code) == '<' || GET_RTX_CLASS (code) == '2')
return (rtx_equal_for_memref_p (XEXP (x, 0), XEXP (y, 0))
&& rtx_equal_for_memref_p (XEXP (x, 1), XEXP (y, 1)));
else if (GET_RTX_CLASS (code) == '1')
return rtx_equal_for_memref_p (XEXP (x, 0), XEXP (y, 0));
/* Compare the elements. If any pair of corresponding elements
fail to match, return 0 for the whole things. */