From 15a68a354c696b029ffd854973614b5d1bf71f60 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Fri, 17 Aug 2018 14:03:38 -0400 Subject: [PATCH] target/arm: Ignore float_flag_input_denormal from fp_status_f16 When FZ is set, input_denormal exceptions are recognized, but this does not happen with FZ16. The softfloat code has no way to distinguish these bits and will raise such exceptions into fp_status_f16.flags, so ignore them when computing the accumulated flags. Backports commit 19062c169e5bcdda3d60df9161228e107bf0f96e from qemu --- qemu/target/arm/helper.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/qemu/target/arm/helper.c b/qemu/target/arm/helper.c index c08a205c..157fea14 100644 --- a/qemu/target/arm/helper.c +++ b/qemu/target/arm/helper.c @@ -10554,9 +10554,12 @@ uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env) fpscr = (env->vfp.xregs[ARM_VFP_FPSCR] & 0xffc8ffff) | (env->vfp.vec_len << 16) | (env->vfp.vec_stride << 20); + i = get_float_exception_flags(&env->vfp.fp_status); i |= get_float_exception_flags(&env->vfp.standard_fp_status); - i |= get_float_exception_flags(&env->vfp.fp_status_f16); + /* FZ16 does not generate an input denormal exception. */ + i |= (get_float_exception_flags(&env->vfp.fp_status_f16) + & ~float_flag_input_denormal); fpscr |= vfp_exceptbits_from_host(i); return fpscr; }