From: Peter Maydell <peter.maydell@linaro.org>
Date: Thu, 19 May 2011 13:46:18 +0000 (+0100)
Subject: target-arm: Signal Underflow when denormal flushed to zero on output
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=36802b6b1ed7887aeae5d027f86a969400f8824a;p=qemu.git

target-arm: Signal Underflow when denormal flushed to zero on output

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>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/target-arm/helper.c b/target-arm/helper.c
index f07252768a..05b3ccca2d 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;