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[7/7] target-arm: Signal Underflow when denormal flushed to zero on output

Message ID 1304686095-30265-8-git-send-email-peter.maydell@linaro.org
State New
Headers show

Commit Message

Peter Maydell May 6, 2011, 12:48 p.m. UTC 
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(-)
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Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index de00468..149fc82 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;