[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [PATCH stable-1.1 09/26] target-xtensa: fix CCOUNT for cond

From: Michael Roth
Subject: [Qemu-devel] [PATCH stable-1.1 09/26] target-xtensa: fix CCOUNT for conditional branches
Date: Fri, 22 Jun 2012 19:33:13 -0500

From: Max Filippov <address@hidden>

Taken conditional branches fail to update CCOUNT register because
accumulated ccount_delta is reset during translation of non-taken
branch. To fix it only update CCOUNT once per conditional branch
instruction translation.

This fixes guest linux freeze on LTP waitpid06 test.

Signed-off-by: Max Filippov <address@hidden>
Signed-off-by: Blue Swirl <address@hidden>
 target-xtensa/translate.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index 521c0e6..a542a31 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -388,6 +388,7 @@ static bool gen_check_loop_end(DisasContext *dc, int slot)
             dc->next_pc == dc->lend) {
         int label = gen_new_label();
+        gen_advance_ccount(dc);
         tcg_gen_brcondi_i32(TCG_COND_EQ, cpu_SR[LCOUNT], 0, label);
         tcg_gen_subi_i32(cpu_SR[LCOUNT], cpu_SR[LCOUNT], 1);
         gen_jumpi(dc, dc->lbeg, slot);
@@ -410,6 +411,7 @@ static void gen_brcond(DisasContext *dc, TCGCond cond,
     int label = gen_new_label();
+    gen_advance_ccount(dc);
     tcg_gen_brcond_i32(cond, t0, t1, label);
     gen_jumpi_check_loop_end(dc, 0);

reply via email to

[Prev in Thread] Current Thread [Next in Thread]