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target-xtensa: fix CCOUNT for conditional branches

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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 <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2012-05-28 03:18:33 +04:00 committed by Blue Swirl
parent 9d70c4b7b8
commit d865f30739
1 changed files with 2 additions and 0 deletions
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2
target-xtensa/translate.c
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@ -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);
gen_set_label(label);