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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: alex.bennee@linaro.org, mmorrell@tachyum.com,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Yoshinori Sato" <ysato@users.sourceforge.jp>
Subject: [PATCH 06/11] target/rx: Handle the FPSW.DN bit in helper_set_fpsw
Date: Wed, 26 May 2021 21:14:00 -0700	[thread overview]
Message-ID: <20210527041405.391567-7-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210527041405.391567-1-richard.henderson@linaro.org>

Both input and output denormals flush to zero when DN is set.

Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/rx/op_helper.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/target/rx/op_helper.c b/target/rx/op_helper.c
index ef904eb5f9..2139def3b2 100644
--- a/target/rx/op_helper.c
+++ b/target/rx/op_helper.c
@@ -127,13 +127,20 @@ void helper_set_fpsw(CPURXState *env, uint32_t val)
         float_round_down,
     };
     uint32_t fpsw = env->fpsw;
+    bool dn;
+
     fpsw |= 0x7fffff03;
     val &= ~0x80000000;
     fpsw &= val;
     FIELD_DP32(fpsw, FPSW, FS, FIELD_EX32(fpsw, FPSW, FLAGS) != 0);
     env->fpsw = fpsw;
-    set_float_rounding_mode(roundmode[FIELD_EX32(env->fpsw, FPSW, RM)],
+
+    set_float_rounding_mode(roundmode[FIELD_EX32(fpsw, FPSW, RM)],
                             &env->fp_status);
+
+    dn = FIELD_EX32(env->fpsw, FPSW, DN);
+    set_flush_to_zero(dn, &env->fp_status);
+    set_flush_inputs_to_zero(dn, &env->fp_status);
 }
 
 #define FLOATOP(op, func)                                           \
-- 
2.25.1



  parent reply	other threads:[~2021-05-27  4:18 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27  4:13 [PATCH 00/11] softfloat: Improve denormal handling Richard Henderson
2021-05-27  4:13 ` [PATCH 01/11] softfloat: Rename float_flag_input_denormal to float_flag_iflush_denormal Richard Henderson
2021-06-07 15:16   ` Alex Bennée
2021-06-19 15:08   ` Philippe Mathieu-Daudé
2021-05-27  4:13 ` [PATCH 02/11] softfloat: Rename float_flag_output_denormal to float_flag_oflush_denormal Richard Henderson
2021-06-07 15:16   ` Alex Bennée
2021-06-19 15:08   ` Philippe Mathieu-Daudé
2021-05-27  4:13 ` [PATCH 03/11] softfloat: Introduce float_flag_inorm_denormal Richard Henderson
2021-05-28 17:41   ` Michael Morrell
2021-05-29 15:21     ` Richard Henderson
2021-07-14 16:44       ` Michael Morrell
2021-07-14 16:57         ` Richard Henderson
2021-07-14 17:50           ` Michael Morrell
2022-01-12  0:02             ` Michael Morrell
2021-06-07 15:35   ` Alex Bennée
2021-06-07 16:28     ` Alex Bennée
2021-06-07 16:41     ` Richard Henderson
2021-06-07 17:19       ` Alex Bennée
2021-06-07 20:52         ` Richard Henderson
2021-05-27  4:13 ` [PATCH 04/11] softfloat: Introduce float_flag_result_denormal Richard Henderson
2021-06-07 16:30   ` Alex Bennée
2021-06-19 15:10   ` Philippe Mathieu-Daudé
2021-05-27  4:13 ` [PATCH 05/11] target/i386: Use float_flag_inorm_denormal Richard Henderson
2021-06-19 18:41   ` Richard Henderson
2021-05-27  4:14 ` Richard Henderson [this message]
2021-05-28 15:34   ` [PATCH 06/11] target/rx: Handle the FPSW.DN bit in helper_set_fpsw Yoshinori Sato
2021-05-27  4:14 ` [PATCH 07/11] target/rx: Use FloatRoundMode " Richard Henderson
2021-05-28 15:35   ` Yoshinori Sato
2021-06-01  3:27   ` Philippe Mathieu-Daudé
2021-05-27  4:14 ` [PATCH 08/11] target/rx: Fix setting of FPSW.CE Richard Henderson
2021-05-28 15:35   ` Yoshinori Sato
2021-05-27  4:14 ` [PATCH 09/11] target/mips: Drop inline markers from msa_helper.c Richard Henderson
2021-06-01  3:27   ` Philippe Mathieu-Daudé
2021-05-27  4:14 ` [PATCH 10/11] target/mips: Do not check MSACSR_FS_MASK in update_msacsr Richard Henderson
2021-06-19 15:15   ` Philippe Mathieu-Daudé
2021-05-27  4:14 ` [PATCH 11/11] target/mips: Drop denormal operand to update_msacsr Richard Henderson
2021-06-01  3:29   ` Philippe Mathieu-Daudé
2021-06-07 16:31 ` [PATCH 00/11] softfloat: Improve denormal handling Alex Bennée

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