From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: alex.bennee@linaro.org, mmorrell@tachyum.com
Subject: [PATCH 04/11] softfloat: Introduce float_flag_result_denormal
Date: Wed, 26 May 2021 21:13:58 -0700 [thread overview]
Message-ID: <20210527041405.391567-5-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210527041405.391567-1-richard.henderson@linaro.org>
Create a new exception flag for reporting output denormals
that are not flushed to zero.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/fpu/softfloat-types.h | 3 ++-
fpu/softfloat-parts.c.inc | 8 ++++++--
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h
index 174100e50e..83632aa09f 100644
--- a/include/fpu/softfloat-types.h
+++ b/include/fpu/softfloat-types.h
@@ -151,6 +151,7 @@ enum {
float_flag_inorm_denormal = 0x0020, /* denormal input, normalized */
float_flag_iflush_denormal = 0x0040, /* denormal input, flushed to zero */
float_flag_oflush_denormal = 0x0080, /* denormal result, flushed to zero */
+ float_flag_result_denormal = 0x0100, /* denormal result, not flushed */
};
/*
@@ -170,8 +171,8 @@ typedef enum __attribute__((__packed__)) {
*/
typedef struct float_status {
+ uint16_t float_exception_flags;
FloatRoundMode float_rounding_mode;
- uint8_t float_exception_flags;
FloatX80RoundPrec floatx80_rounding_precision;
bool tininess_before_rounding;
/* should denormalised results go to zero and set the inexact flag? */
diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
index 16d4425419..a21fcec3e5 100644
--- a/fpu/softfloat-parts.c.inc
+++ b/fpu/softfloat-parts.c.inc
@@ -276,8 +276,12 @@ static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
if (is_tiny && (flags & float_flag_inexact)) {
flags |= float_flag_underflow;
}
- if (exp == 0 && frac_eqz(p)) {
- p->cls = float_class_zero;
+ if (exp == 0) {
+ if (frac_eqz(p)) {
+ p->cls = float_class_zero;
+ } else {
+ flags |= float_flag_result_denormal;
+ }
}
}
p->exp = exp;
--
2.25.1
next prev parent reply other threads:[~2021-05-27 4:20 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 ` Richard Henderson [this message]
2021-06-07 16:30 ` [PATCH 04/11] softfloat: Introduce float_flag_result_denormal 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 ` [PATCH 06/11] target/rx: Handle the FPSW.DN bit in helper_set_fpsw Richard Henderson
2021-05-28 15:34 ` 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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