mirror of https://github.com/proxmox/mirror_qemu
tcg/optimize: Split out fold_ix_to_i
Pull the "op r, 0, b => movi r, 0" optimization into a function, and use it in fold_shift. Reviewed-by: Luis Pires <luis.pires@eldorado.org.br> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>master
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@ -731,6 +731,15 @@ static bool fold_to_not(OptContext *ctx, TCGOp *op, int idx)
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return false;
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return false;
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}
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}
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/* If the binary operation has first argument @i, fold to @i. */
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static bool fold_ix_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
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{
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if (arg_is_const(op->args[1]) && arg_info(op->args[1])->val == i) {
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return tcg_opt_gen_movi(ctx, op, op->args[0], i);
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}
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return false;
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}
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/* If the binary operation has first argument @i, fold to NOT. */
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/* If the binary operation has first argument @i, fold to NOT. */
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static bool fold_ix_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
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static bool fold_ix_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
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{
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{
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@ -1384,6 +1393,7 @@ static bool fold_sextract(OptContext *ctx, TCGOp *op)
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static bool fold_shift(OptContext *ctx, TCGOp *op)
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static bool fold_shift(OptContext *ctx, TCGOp *op)
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{
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{
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if (fold_const2(ctx, op) ||
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if (fold_const2(ctx, op) ||
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fold_ix_to_i(ctx, op, 0) ||
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fold_xi_to_x(ctx, op, 0)) {
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fold_xi_to_x(ctx, op, 0)) {
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return true;
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return true;
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}
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}
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@ -1552,24 +1562,6 @@ void tcg_optimize(TCGContext *s)
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break;
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break;
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}
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}
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/* Simplify expressions for "shift/rot r, 0, a => movi r, 0",
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and "sub r, 0, a => neg r, a" case. */
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switch (opc) {
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CASE_OP_32_64(shl):
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CASE_OP_32_64(shr):
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CASE_OP_32_64(sar):
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CASE_OP_32_64(rotl):
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CASE_OP_32_64(rotr):
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if (arg_is_const(op->args[1])
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&& arg_info(op->args[1])->val == 0) {
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tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
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continue;
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}
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break;
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default:
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break;
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}
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/* Simplify using known-zero bits. Currently only ops with a single
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/* Simplify using known-zero bits. Currently only ops with a single
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output argument is supported. */
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output argument is supported. */
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z_mask = -1;
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z_mask = -1;
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