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[PATCH 4/5] target/loongarch: flogb_{s/d} add set float_flag_divbyzero
From: |
Song Gao |
Subject: |
[PATCH 4/5] target/loongarch: flogb_{s/d} add set float_flag_divbyzero |
Date: |
Sat, 17 Sep 2022 15:59:49 +0800 |
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