From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Cc: Paul Brook <paul@codesourcery.com>,
Aurelien Jarno <aurelien@aurel32.net>,
patches@linaro.org
Subject: [Qemu-devel] [PATCH v2 5/6] target-arm: Signal Underflow when denormal flushed to zero on output
Date: Thu, 19 May 2011 14:46:18 +0100 [thread overview]
Message-ID: <1305812779-23175-6-git-send-email-peter.maydell@linaro.org> (raw)
In-Reply-To: <1305812779-23175-1-git-send-email-peter.maydell@linaro.org>
On ARM the architecture mandates that when an output denormal is flushed to
zero we must set the FPSCR UFC (underflow) bit, so map softfloat's
float_flag_output_denormal accordingly.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target-arm/helper.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index f072527..05b3ccc 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2355,7 +2355,7 @@ static inline int vfp_exceptbits_from_host(int host_bits)
target_bits |= 2;
if (host_bits & float_flag_overflow)
target_bits |= 4;
- if (host_bits & float_flag_underflow)
+ if (host_bits & (float_flag_underflow | float_flag_output_denormal))
target_bits |= 8;
if (host_bits & float_flag_inexact)
target_bits |= 0x10;
--
1.7.1
next prev parent reply other threads:[~2011-05-19 13:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 13:46 [Qemu-devel] [PATCH v2 0/6] target-arm: Fix bugs in fp exception flag setting Peter Maydell
2011-05-19 13:46 ` [Qemu-devel] [PATCH v2 1/6] target-arm: Don't set FP exceptions in recip, recip_sqrt estimate fns Peter Maydell
2011-05-19 13:46 ` [Qemu-devel] [PATCH v2 2/6] target-arm: Signal InputDenormal for VRECPE, VRSQRTE, VRECPS, VRSQRTS Peter Maydell
2011-05-19 13:46 ` [Qemu-devel] [PATCH v2 3/6] target-arm: Signal InvalidOp for Neon GE and GT compares of QNaN Peter Maydell
2011-05-19 13:46 ` [Qemu-devel] [PATCH v2 4/6] softfloat: Add new flag for when denormal result is flushed to zero Peter Maydell
2011-05-19 13:46 ` Peter Maydell [this message]
2011-05-19 13:46 ` [Qemu-devel] [PATCH v2 6/6] target-arm: Use correct float status for Neon int-float conversions Peter Maydell
2011-05-25 20:49 ` Stefan Weil
2011-05-25 21:31 ` Peter Maydell
2011-05-23 21:33 ` [Qemu-devel] [PATCH v2 0/6] target-arm: Fix bugs in fp exception flag setting Aurelien Jarno
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