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tcg/optimize: Emit add r,r,-1 in fold_setcond_tst_pow2

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We canonicalize subtract with constant to add with constant.
Fix this missed instance.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-01-06 22:06:08 -08:00
parent 899281c8f5
commit 93a9ddb84a
1 changed files with 3 additions and 5 deletions
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8
tcg/optimize.c
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@ -2301,7 +2301,7 @@ static int fold_setcond_zmask(OptContext *ctx, TCGOp *op, bool neg)
static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
{
TCGOpcode sub_opc, xor_opc, neg_opc, shr_opc;
TCGOpcode xor_opc, neg_opc, shr_opc;
TCGOpcode uext_opc = 0, sext_opc = 0;
TCGCond cond = op->args[3];
TCGArg ret, src1, src2;
@ -2323,7 +2323,6 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
switch (ctx->type) {
case TCG_TYPE_I32:
sub_opc = INDEX_op_sub_i32;
xor_opc = INDEX_op_xor_i32;
shr_opc = INDEX_op_shr_i32;
neg_opc = INDEX_op_neg_i32;
@ -2335,7 +2334,6 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
}
break;
case TCG_TYPE_I64:
sub_opc = INDEX_op_sub_i64;
xor_opc = INDEX_op_xor_i64;
shr_opc = INDEX_op_shr_i64;
neg_opc = INDEX_op_neg_i64;
@ -2379,10 +2377,10 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
}
if (neg && inv) {
op2 = opt_insert_after(ctx, op, sub_opc, 3);
op2 = opt_insert_after(ctx, op, INDEX_op_add, 3);
op2->args[0] = ret;
op2->args[1] = ret;
op2->args[2] = arg_new_constant(ctx, 1);
op2->args[2] = arg_new_constant(ctx, -1);
} else if (inv) {
op2 = opt_insert_after(ctx, op, xor_opc, 3);
op2->args[0] = ret;