From: Song Gao <gaosong@loongson.cn>
To: qemu-devel@nongnu.org
Cc: richard.henderson@linaro.org, peter.maydell@linaro.org,
alex.bennee@linaro.org, gaosong@loongson.cn, maobibo@loongson.cn,
yangxiaojuan@loongson.cn
Subject: [PATCH 4/5] target/loongarch: flogb_{s/d} add set float_flag_divbyzero
Date: Sat, 17 Sep 2022 15:59:49 +0800 [thread overview]
Message-ID: <20220917075950.1412309-5-gaosong@loongson.cn> (raw)
In-Reply-To: <20220917075950.1412309-1-gaosong@loongson.cn>
if fj ==0 or fj == INT32_MIN/INT64_MIN, LoongArch host set fcsr cause exception FP_DIV0,
So we need set exception flags float_flagdivbyzero if fj ==0.
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
target/loongarch/fpu_helper.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/target/loongarch/fpu_helper.c b/target/loongarch/fpu_helper.c
index 1a24667eaf..8ddfbd1abd 100644
--- a/target/loongarch/fpu_helper.c
+++ b/target/loongarch/fpu_helper.c
@@ -322,6 +322,13 @@ uint64_t helper_flogb_s(CPULoongArchState *env, uint64_t fj)
fp = float32_log2((uint32_t)fj, status);
fd = nanbox_s(float32_round_to_int(fp, status));
set_float_rounding_mode(old_mode, status);
+ /*
+ * LoongArch host if fj == 0 or INT32_MIN , set the fcsr cause FP_DIV0
+ * so we need set exception flags float_flag_divbyzero.
+ */
+ if (((uint32_t)fj == 0) | ((uint32_t)fj == INT32_MIN )) {
+ set_float_exception_flags(float_flag_divbyzero, status);
+ }
update_fcsr0_mask(env, GETPC(), float_flag_inexact);
return fd;
}
@@ -336,6 +343,13 @@ uint64_t helper_flogb_d(CPULoongArchState *env, uint64_t fj)
fd = float64_log2(fj, status);
fd = float64_round_to_int(fd, status);
set_float_rounding_mode(old_mode, status);
+ /*
+ * LoongArch host if fj == 0 or INT64_MIN , set the fcsr cause FP_DIV0
+ * so we need set exception flags float_flag_divbyzero.
+ */
+ if ( (fj == 0) | (fj == INT64_MIN)) {
+ set_float_exception_flags(float_flag_divbyzero, status);
+ }
update_fcsr0_mask(env, GETPC(), float_flag_inexact);
return fd;
}
--
2.31.1
next prev parent reply other threads:[~2022-09-17 8:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-17 7:59 [PATCH 0/5] Fix some bugs Song Gao
2022-09-17 7:59 ` [PATCH 1/5] target/loongarch: ftint_xxx insns set the result high 32bit 0xffffffff Song Gao
2022-09-17 7:59 ` [PATCH 2/5] target/loongarch: bstrins.w need set dest register EXT_SIGN Song Gao
2022-09-17 8:41 ` Qi Hu
2022-09-17 9:16 ` gaosong
2022-09-17 10:56 ` Qi Hu
2022-09-17 7:59 ` [PATCH 3/5] target/loongarch: Fix fnm{sub/add}_{s/d} set wrong flags Song Gao
2022-09-17 7:59 ` Song Gao [this message]
2022-09-17 7:59 ` [PATCH 5/5] target/loongarch: div if x/0 set dividend to 0 Song Gao
2022-09-17 8:59 ` Qi Hu
2022-09-17 9:12 ` gaosong
2022-09-17 10:12 ` Richard Henderson
2022-09-19 11:45 ` gaosong
2022-09-20 2:18 ` Qi Hu
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