From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 17 Oct 2023 02:10:42 +0000 (-0700)
Subject: tcg: Optimize past conditional branches
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d97f8f394184403beb655f5f077bef8ef83ffa3a;p=qemu.git

tcg: Optimize past conditional branches

We already register allocate through extended basic blocks,
optimize through extended basic blocks as well.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 3013eb04e6..2db5177c32 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -688,12 +688,14 @@ static void finish_folding(OptContext *ctx, TCGOp *op)
     int i, nb_oargs;
 
     /*
-     * For an opcode that ends a BB, reset all temp data.
-     * We do no cross-BB optimization.
+     * We only optimize extended basic blocks.  If the opcode ends a BB
+     * and is not a conditional branch, reset all temp data.
      */
     if (def->flags & TCG_OPF_BB_END) {
-        memset(&ctx->temps_used, 0, sizeof(ctx->temps_used));
         ctx->prev_mb = NULL;
+        if (!(def->flags & TCG_OPF_COND_BRANCH)) {
+            memset(&ctx->temps_used, 0, sizeof(ctx->temps_used));
+        }
         return;
     }