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[PATCH 30/48] tcg/optimize: Split out fold_xx_to_i
From: |
Richard Henderson |
Subject: |
[PATCH 30/48] tcg/optimize: Split out fold_xx_to_i |
Date: |
Sun, 29 Aug 2021 23:24:33 -0700 |
Pull the "op r, a, a => movi r, 0" optimization into a function,
and use it in the outer opcode fold functions.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/optimize.c | 41 ++++++++++++++++++++++++-----------------
1 file changed, 24 insertions(+), 17 deletions(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index ee674fe623..f48d0bc52d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -695,6 +695,15 @@ static bool fold_const2(OptContext *ctx, TCGOp *op)
return false;
}
+/* If the binary operation has both arguments equal, fold to @i. */
+static bool fold_xx_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
+{
+ if (args_are_copies(op->args[1], op->args[2])) {
+ return tcg_opt_gen_movi(ctx, op, op->args[0], i);
+ }
+ return false;
+}
+
/*
* These outermost fold_<op> functions are sorted alphabetically.
*/
@@ -744,7 +753,11 @@ static bool fold_and(OptContext *ctx, TCGOp *op)
static bool fold_andc(OptContext *ctx, TCGOp *op)
{
- return fold_const2(ctx, op);
+ if (fold_const2(ctx, op) ||
+ fold_xx_to_i(ctx, op, 0)) {
+ return true;
+ }
+ return false;
}
static bool fold_brcond(OptContext *ctx, TCGOp *op)
@@ -1211,7 +1224,11 @@ static bool fold_shift(OptContext *ctx, TCGOp *op)
static bool fold_sub(OptContext *ctx, TCGOp *op)
{
- return fold_const2(ctx, op);
+ if (fold_const2(ctx, op) ||
+ fold_xx_to_i(ctx, op, 0)) {
+ return true;
+ }
+ return false;
}
static bool fold_sub2_i32(OptContext *ctx, TCGOp *op)
@@ -1221,7 +1238,11 @@ static bool fold_sub2_i32(OptContext *ctx, TCGOp *op)
static bool fold_xor(OptContext *ctx, TCGOp *op)
{
- return fold_const2(ctx, op);
+ if (fold_const2(ctx, op) ||
+ fold_xx_to_i(ctx, op, 0)) {
+ return true;
+ }
+ return false;
}
/* Propagate constants and copies, fold constant expressions. */
@@ -1726,20 +1747,6 @@ void tcg_optimize(TCGContext *s)
break;
}
- /* Simplify expression for "op r, a, a => movi r, 0" cases */
- switch (opc) {
- CASE_OP_32_64_VEC(andc):
- CASE_OP_32_64_VEC(sub):
- CASE_OP_32_64_VEC(xor):
- if (args_are_copies(op->args[1], op->args[2])) {
- tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
- continue;
- }
- break;
- default:
- break;
- }
-
/*
* Process each opcode.
* Sorted alphabetically by opcode as much as possible.
--
2.25.1
- [PATCH 22/48] tcg/optimize: Split out fold_movcond, (continued)
- [PATCH 22/48] tcg/optimize: Split out fold_movcond, Richard Henderson, 2021/08/30
- [PATCH 23/48] tcg/optimize: Split out fold_extract2, Richard Henderson, 2021/08/30
- [PATCH 15/48] tcg/optimize: Split out fold_const{1,2}, Richard Henderson, 2021/08/30
- [PATCH 10/48] tcg/optimize: Change fail return for do_constant_folding_cond*, Richard Henderson, 2021/08/30
- [PATCH 25/48] tcg/optimize: Split out fold_deposit, Richard Henderson, 2021/08/30
- [PATCH 24/48] tcg/optimize: Split out fold_extract, fold_sextract, Richard Henderson, 2021/08/30
- [PATCH 27/48] tcg/optimize: Split out fold_bswap, Richard Henderson, 2021/08/30
- [PATCH 29/48] tcg/optimize: Split out fold_mov, Richard Henderson, 2021/08/30
- [PATCH 30/48] tcg/optimize: Split out fold_xx_to_i,
Richard Henderson <=
- [PATCH 38/48] tcg/optimize: Split out fold_masks, Richard Henderson, 2021/08/30
- [PATCH 26/48] tcg/optimize: Split out fold_count_zeros, Richard Henderson, 2021/08/30
- [PATCH 28/48] tcg/optimize: Split out fold_dup, fold_dup2, Richard Henderson, 2021/08/30
- [PATCH 11/48] tcg/optimize: Return true from tcg_opt_gen_{mov,movi}, Richard Henderson, 2021/08/30
- [PATCH 32/48] tcg/optimize: Split out fold_xi_to_i, Richard Henderson, 2021/08/30
- [PATCH 34/48] tcg/optimize: Split out fold_to_not, Richard Henderson, 2021/08/30
- [PATCH 31/48] tcg/optimize: Split out fold_xx_to_x, Richard Henderson, 2021/08/30