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(subst, case AND): Only make IF_THEN_ELSE if conditional moves exist.

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From-SVN: r1903
This commit is contained in:
Richard Kenner 1992-08-19 21:33:19 -04:00
parent 674ba2d6bf
commit 53e33d9533
1 changed files with 5 additions and 0 deletions
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5
gcc/combine.c
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@ -3638,6 +3638,8 @@ subst (x, from, to, in_dest, unique_copy)
goto restart;
}
#ifdef HAVE_conditional_move
/* If we have (and A B) with A not an object but that is known to
be -1 or 0, this is equivalent to the expression
(if_then_else (ne A (const_int 0)) B (const_int 0))
@ -3660,6 +3662,7 @@ subst (x, from, to, in_dest, unique_copy)
XEXP (x, 1), const0_rtx);
goto restart;
}
#endif
/* In the following group of tests (and those in case IOR below),
we start with some combination of logical operations and apply
@ -4799,6 +4802,8 @@ force_to_mode (x, mode, bits, reg)
&& sub_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
|| (code == MULT && (smul_optab->handlers[(int) mode].insn_code
== CODE_FOR_nothing))
|| (code == AND
&& and_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
|| (code == IOR
&& ior_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
|| (code == XOR && (xor_optab->handlers[(int) mode].insn_code