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[PATCH v4 26/51] tcg/optimize: Split out fold_count_zeros
From: |
Richard Henderson |
Subject: |
[PATCH v4 26/51] tcg/optimize: Split out fold_count_zeros |
Date: |
Tue, 26 Oct 2021 16:09:18 -0700 |
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>
---
tcg/optimize.c | 32 ++++++++++++++++++--------------
1 file changed, 18 insertions(+), 14 deletions(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 2c57d08760..dd65f1afcd 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -873,6 +873,20 @@ static bool fold_call(OptContext *ctx, TCGOp *op)
return true;
}
+static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
+{
+ if (arg_is_const(op->args[1])) {
+ uint64_t t = arg_info(op->args[1])->val;
+
+ if (t != 0) {
+ t = do_constant_folding(op->opc, t, 0);
+ return tcg_opt_gen_movi(ctx, op, op->args[0], t);
+ }
+ return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
+ }
+ return false;
+}
+
static bool fold_ctpop(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op);
@@ -1739,20 +1753,6 @@ void tcg_optimize(TCGContext *s)
}
break;
- CASE_OP_32_64(clz):
- CASE_OP_32_64(ctz):
- if (arg_is_const(op->args[1])) {
- TCGArg v = arg_info(op->args[1])->val;
- if (v != 0) {
- tmp = do_constant_folding(opc, v, 0);
- tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
- } else {
- tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[2]);
- }
- continue;
- }
- break;
-
default:
break;
@@ -1777,6 +1777,10 @@ void tcg_optimize(TCGContext *s)
case INDEX_op_brcond2_i32:
done = fold_brcond2(&ctx, op);
break;
+ CASE_OP_32_64(clz):
+ CASE_OP_32_64(ctz):
+ done = fold_count_zeros(&ctx, op);
+ break;
CASE_OP_32_64(ctpop):
done = fold_ctpop(&ctx, op);
break;
--
2.25.1
- [PATCH v4 10/51] tcg/optimize: Change fail return for do_constant_folding_cond*, (continued)
- [PATCH v4 10/51] tcg/optimize: Change fail return for do_constant_folding_cond*, Richard Henderson, 2021/10/26
- [PATCH v4 11/51] tcg/optimize: Return true from tcg_opt_gen_{mov, movi}, Richard Henderson, 2021/10/26
- [PATCH v4 14/51] tcg/optimize: Split out fold_mb, fold_qemu_{ld,st}, Richard Henderson, 2021/10/26
- [PATCH v4 18/51] tcg/optimize: Split out fold_brcond, Richard Henderson, 2021/10/26
- [PATCH v4 19/51] tcg/optimize: Split out fold_setcond, Richard Henderson, 2021/10/26
- [PATCH v4 20/51] tcg/optimize: Split out fold_mulu2_i32, Richard Henderson, 2021/10/26
- [PATCH v4 17/51] tcg/optimize: Split out fold_brcond2, Richard Henderson, 2021/10/26
- [PATCH v4 21/51] tcg/optimize: Split out fold_addsub2_i32, Richard Henderson, 2021/10/26
- [PATCH v4 22/51] tcg/optimize: Split out fold_movcond, Richard Henderson, 2021/10/26
- [PATCH v4 15/51] tcg/optimize: Split out fold_const{1,2}, Richard Henderson, 2021/10/26
- [PATCH v4 26/51] tcg/optimize: Split out fold_count_zeros,
Richard Henderson <=
- [PATCH v4 23/51] tcg/optimize: Split out fold_extract2, Richard Henderson, 2021/10/26
- [PATCH v4 24/51] tcg/optimize: Split out fold_extract, fold_sextract, Richard Henderson, 2021/10/26
- [PATCH v4 16/51] tcg/optimize: Split out fold_setcond2, Richard Henderson, 2021/10/26
- [PATCH v4 27/51] tcg/optimize: Split out fold_bswap, Richard Henderson, 2021/10/26
- [PATCH v4 35/51] tcg/optimize: Split out fold_sub_to_neg, Richard Henderson, 2021/10/26
- [PATCH v4 28/51] tcg/optimize: Split out fold_dup, fold_dup2, Richard Henderson, 2021/10/26
- [PATCH v4 29/51] tcg/optimize: Split out fold_mov, Richard Henderson, 2021/10/26
- [PATCH v4 39/51] tcg/optimize: Expand fold_mulu2_i32 to all 4-arg multiplies, Richard Henderson, 2021/10/26
- [PATCH v4 25/51] tcg/optimize: Split out fold_deposit, Richard Henderson, 2021/10/26