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target/arm/vfp_helper: Extract vfp_set_fpscr_to_host()

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The vfp_set_fpscr() helper contains code specific to the host
floating point implementation (here the SoftFloat library).
Extract this code to vfp_set_fpscr_to_host().

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190701132516.26392-16-philmd@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2019-07-01 17:26:21 +01:00 committed by Peter Maydell
parent 20e62dd8c8
commit e9d652824b
1 changed files with 66 additions and 61 deletions
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127
target/arm/vfp_helper.c
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@ -81,71 +81,11 @@ static inline int vfp_exceptbits_to_host(int target_bits)
return host_bits;
}
uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env)
{
uint32_t i, fpscr;
fpscr = env->vfp.xregs[ARM_VFP_FPSCR]
| (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);
/* 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);
i = env->vfp.qc[0] | env->vfp.qc[1] | env->vfp.qc[2] | env->vfp.qc[3];
fpscr |= i ? FPCR_QC : 0;
return fpscr;
}
uint32_t vfp_get_fpscr(CPUARMState *env)
{
return HELPER(vfp_get_fpscr)(env);
}
void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
static void vfp_set_fpscr_to_host(CPUARMState *env, uint32_t val)
{
int i;
uint32_t changed = env->vfp.xregs[ARM_VFP_FPSCR];
/* When ARMv8.2-FP16 is not supported, FZ16 is RES0. */
if (!cpu_isar_feature(aa64_fp16, env_archcpu(env))) {
val &= ~FPCR_FZ16;
}
if (arm_feature(env, ARM_FEATURE_M)) {
/*
* M profile FPSCR is RES0 for the QC, STRIDE, FZ16, LEN bits
* and also for the trapped-exception-handling bits IxE.
*/
val &= 0xf7c0009f;
}
/*
* We don't implement trapped exception handling, so the
* trap enable bits, IDE|IXE|UFE|OFE|DZE|IOE are all RAZ/WI (not RES0!)
*
* If we exclude the exception flags, IOC|DZC|OFC|UFC|IXC|IDC
* (which are stored in fp_status), and the other RES0 bits
* in between, then we clear all of the low 16 bits.
*/
env->vfp.xregs[ARM_VFP_FPSCR] = val & 0xf7c80000;
env->vfp.vec_len = (val >> 16) & 7;
env->vfp.vec_stride = (val >> 20) & 3;
/*
* The bit we set within fpscr_q is arbitrary; the register as a
* whole being zero/non-zero is what counts.
*/
env->vfp.qc[0] = val & FPCR_QC;
env->vfp.qc[1] = 0;
env->vfp.qc[2] = 0;
env->vfp.qc[3] = 0;
changed ^= val;
if (changed & (3 << 22)) {
i = (val >> 22) & 3;
@ -193,6 +133,71 @@ void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
set_float_exception_flags(0, &env->vfp.standard_fp_status);
}
uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env)
{
uint32_t i, fpscr;
fpscr = env->vfp.xregs[ARM_VFP_FPSCR]
| (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);
/* 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);
i = env->vfp.qc[0] | env->vfp.qc[1] | env->vfp.qc[2] | env->vfp.qc[3];
fpscr |= i ? FPCR_QC : 0;
return fpscr;
}
uint32_t vfp_get_fpscr(CPUARMState *env)
{
return HELPER(vfp_get_fpscr)(env);
}
void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
{
/* When ARMv8.2-FP16 is not supported, FZ16 is RES0. */
if (!cpu_isar_feature(aa64_fp16, env_archcpu(env))) {
val &= ~FPCR_FZ16;
}
if (arm_feature(env, ARM_FEATURE_M)) {
/*
* M profile FPSCR is RES0 for the QC, STRIDE, FZ16, LEN bits
* and also for the trapped-exception-handling bits IxE.
*/
val &= 0xf7c0009f;
}
/*
* We don't implement trapped exception handling, so the
* trap enable bits, IDE|IXE|UFE|OFE|DZE|IOE are all RAZ/WI (not RES0!)
*
* If we exclude the exception flags, IOC|DZC|OFC|UFC|IXC|IDC
* (which are stored in fp_status), and the other RES0 bits
* in between, then we clear all of the low 16 bits.
*/
env->vfp.xregs[ARM_VFP_FPSCR] = val & 0xf7c80000;
env->vfp.vec_len = (val >> 16) & 7;
env->vfp.vec_stride = (val >> 20) & 3;
/*
* The bit we set within fpscr_q is arbitrary; the register as a
* whole being zero/non-zero is what counts.
*/
env->vfp.qc[0] = val & FPCR_QC;
env->vfp.qc[1] = 0;
env->vfp.qc[2] = 0;
env->vfp.qc[3] = 0;
vfp_set_fpscr_to_host(env, val);
}
void vfp_set_fpscr(CPUARMState *env, uint32_t val)
{
HELPER(vfp_set_fpscr)(env, val);