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[69/99] target/arm: Fix fp_status_f16 tininess before rounding

Message ID 20180723201748.25573-70-mdroth@linux.vnet.ibm.com
State New
Headers show
Series None | expand

Commit Message

Michael Roth July 23, 2018, 8:17 p.m. UTC 
From: Peter Maydell <peter.maydell@linaro.org>


In commit d81ce0ef2c4f105 we added an extra float_status field
fp_status_fp16 for Arm, but forgot to initialize it correctly
by setting it to float_tininess_before_rounding. This currently
will only cause problems for the new V8_FP16 feature, since the
float-to-float conversion code doesn't use it yet. The effect
would be that we failed to set the Underflow IEEE exception flag
in all the cases where we should.

Add the missing initialization.

Fixes: d81ce0ef2c4f105
Cc: qemu-stable@nongnu.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Message-id: 20180512004311.9299-16-richard.henderson@linaro.org
(cherry picked from commit bcc531f0364796104df4443d17f99b5fb494eca2)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

---
 target/arm/cpu.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.17.1
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Patch

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 022d8c5787..7ebe3fcadf 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -311,6 +311,8 @@  static void arm_cpu_reset(CPUState *s)
                               &env->vfp.fp_status);
     set_float_detect_tininess(float_tininess_before_rounding,
                               &env->vfp.standard_fp_status);
+    set_float_detect_tininess(float_tininess_before_rounding,
+                              &env->vfp.fp_status_f16);
 #ifndef CONFIG_USER_ONLY
     if (kvm_enabled()) {
         kvm_arm_reset_vcpu(cpu);