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jump.c (jump_optimize_1): The first operand in a relational can be a CONST_INT.

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* jump.c (jump_optimize_1): The first operand in a relational
        can be a CONST_INT.
        * optabs.c (emit_conditional_move): Handle relationals which
        have a known true/false result.

From-SVN: r31929
This commit is contained in:
Jeffrey A Law 2000-02-11 12:35:57 -07:00 committed by Jeff Law
parent 2dd8bc0166
commit 144a5f9d45
3 changed files with 18 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
Feb 11 12:30:53 2000 Jeffrey A Law (law@cygnus.com)
* jump.c (jump_optimize_1): The first operand in a relational
can be a CONST_INT.
* optabs.c (emit_conditional_move): Handle relationals which
have a known true/false result.
2000-02-11 Geoff Keating <geoffk@cygnus.com>
* function.c (thread_prologue_and_epilogue_insns): Don't insert

8
gcc/jump.c
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@ -1305,10 +1305,16 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
insn? After all, we're going to delete it. We'd have
to modify emit_conditional_move to take a comparison rtx
instead or write a new function. */
cond0 = gen_reg_rtx (GET_MODE (XEXP (temp4, 0)));
/* We want the target to be able to simplify comparisons with
zero (and maybe other constants as well), so don't create
pseudos for them. There's no need to either. */
if (GET_CODE (XEXP (temp4, 0)) == CONST_INT
|| GET_CODE (XEXP (temp4, 0)) == CONST_DOUBLE)
cond0 = XEXP (temp4, 0);
else
cond0 = gen_reg_rtx (GET_MODE (XEXP (temp4, 0)));
if (GET_CODE (XEXP (temp4, 1)) == CONST_INT
|| GET_CODE (XEXP (temp4, 1)) == CONST_DOUBLE)
cond1 = XEXP (temp4, 1);

6
gcc/optabs.c
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@ -3593,9 +3593,11 @@ emit_conditional_move (target, code, op0, op1, cmode, op2, op3, mode,
= compare_from_rtx (op0, op1, code, unsignedp, cmode, NULL_RTX, 0);
/* ??? Watch for const0_rtx (nop) and const_true_rtx (unconditional)? */
/* We can get const0_rtx or const_true_rtx in some circumstances. Just
return NULL and let the caller figure out how best to deal with this
situation. */
if (GET_CODE (comparison) != code)
/* This shouldn't happen. */
abort ();
return NULL_RTX;
insn = GEN_FCN (icode) (subtarget, comparison, op2, op3);