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| author | Richard Stallman <rms@gnu.org> | 1992-11-06 00:05:51 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-11-06 00:05:51 +0000 |
| commit | cee850230f38b79a66b416b3f530a6524638e9ac (patch) | |
| tree | c83ad80b2559ce551fb3cf7f3746a7a6eecc2967 | |
| parent | 432a2edec07bfa2311541b194071b32d4b9890ec (diff) | |
| download | gcc-cee850230f38b79a66b416b3f530a6524638e9ac.zip gcc-cee850230f38b79a66b416b3f530a6524638e9ac.tar.gz gcc-cee850230f38b79a66b416b3f530a6524638e9ac.tar.bz2 | |
(expand_binop): When trying to expand a multiple word add into multiple single word adds...
(expand_binop): When trying to expand a multiple word
add into multiple single word adds, don't overwrite OP0 and OP1 in
case we must backtrack. We use instead new variables XOP0 and XOP1.
From-SVN: r2696
| -rw-r--r-- | gcc/optabs.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index f054d52..57da821 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -558,6 +558,7 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) optab otheroptab = binoptab == add_optab ? sub_optab : add_optab; int nwords = GET_MODE_BITSIZE (mode) / BITS_PER_WORD; rtx carry_in, carry_out; + rtx xop0, xop1; /* We can handle either a 1 or -1 value for the carry. If STORE_FLAG value is one of those, use it. Otherwise, use 1 since it is the @@ -569,11 +570,11 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) #endif /* Prepare the operands. */ - op0 = force_reg (mode, op0); - op1 = force_reg (mode, op1); + xop0 = force_reg (mode, op0); + xop1 = force_reg (mode, op1); if (target == 0 || GET_CODE (target) != REG - || target == op0 || target == op1) + || target == xop0 || target == xop1) target = gen_reg_rtx (mode); /* Do the actual arithmetic. */ @@ -581,8 +582,8 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) { int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i); rtx target_piece = operand_subword (target, index, 1, mode); - rtx op0_piece = operand_subword_force (op0, index, mode); - rtx op1_piece = operand_subword_force (op1, index, mode); + rtx op0_piece = operand_subword_force (xop0, index, mode); + rtx op1_piece = operand_subword_force (xop1, index, mode); rtx x; /* Main add/subtract of the input operands. */ @@ -641,7 +642,7 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods) temp = emit_move_insn (target, target); REG_NOTES (temp) = gen_rtx (EXPR_LIST, REG_EQUAL, - gen_rtx (binoptab->code, mode, op0, op1), + gen_rtx (binoptab->code, mode, xop0, xop1), REG_NOTES (temp)); return target; } |