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authorChristophe Lyon <christophe.lyon@st.com>2011-02-21 17:38:48 +0100
committerAurelien Jarno <aurelien@aurel32.net>2011-02-24 08:53:36 +0100
commite07be5d2aeecc64b3d245cd20b9ccbeeedc9d1dd (patch)
tree9afed0d25d103b39e65ebc2e5ddeeca8c5fd821e /target-arm
parentfe0e4872e46a5264ea433a22a793538545108564 (diff)
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target-arm: fix support for VRSQRTE.
Now use the same algorithm as described in the ARM ARM. Signed-off-by: Christophe Lyon <christophe.lyon@st.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm')
-rw-r--r--target-arm/helper.c123
1 files changed, 113 insertions, 10 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 031f2ec..1852352 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2755,11 +2755,104 @@ float32 HELPER(recpe_f32)(float32 a, CPUState *env)
return make_float32(val32);
}
+/* The algorithm that must be used to calculate the estimate
+ * is specified by the ARM ARM.
+ */
+static float64 recip_sqrt_estimate(float64 a, CPUState *env)
+{
+ float_status *s = &env->vfp.standard_fp_status;
+ float64 q;
+ int64_t q_int;
+
+ if (float64_lt(a, float64_half, s)) {
+ /* range 0.25 <= a < 0.5 */
+
+ /* a in units of 1/512 rounded down */
+ /* q0 = (int)(a * 512.0); */
+ q = float64_mul(float64_512, a, s);
+ q_int = float64_to_int64_round_to_zero(q, s);
+
+ /* reciprocal root r */
+ /* r = 1.0 / sqrt(((double)q0 + 0.5) / 512.0); */
+ q = int64_to_float64(q_int, s);
+ q = float64_add(q, float64_half, s);
+ q = float64_div(q, float64_512, s);
+ q = float64_sqrt(q, s);
+ q = float64_div(float64_one, q, s);
+ } else {
+ /* range 0.5 <= a < 1.0 */
+
+ /* a in units of 1/256 rounded down */
+ /* q1 = (int)(a * 256.0); */
+ q = float64_mul(float64_256, a, s);
+ int64_t q_int = float64_to_int64_round_to_zero(q, s);
+
+ /* reciprocal root r */
+ /* r = 1.0 /sqrt(((double)q1 + 0.5) / 256); */
+ q = int64_to_float64(q_int, s);
+ q = float64_add(q, float64_half, s);
+ q = float64_div(q, float64_256, s);
+ q = float64_sqrt(q, s);
+ q = float64_div(float64_one, q, s);
+ }
+ /* r in units of 1/256 rounded to nearest */
+ /* s = (int)(256.0 * r + 0.5); */
+
+ q = float64_mul(q, float64_256,s );
+ q = float64_add(q, float64_half, s);
+ q_int = float64_to_int64_round_to_zero(q, s);
+
+ /* return (double)s / 256.0;*/
+ return float64_div(int64_to_float64(q_int, s), float64_256, s);
+}
+
float32 HELPER(rsqrte_f32)(float32 a, CPUState *env)
{
- float_status *s = &env->vfp.fp_status;
- float32 one = int32_to_float32(1, s);
- return float32_div(one, float32_sqrt(a, s), s);
+ float_status *s = &env->vfp.standard_fp_status;
+ int result_exp;
+ float64 f64;
+ uint32_t val;
+ uint64_t val64;
+
+ val = float32_val(a);
+
+ if (float32_is_any_nan(a)) {
+ if (float32_is_signaling_nan(a)) {
+ float_raise(float_flag_invalid, s);
+ }
+ return float32_default_nan;
+ } else if (float32_is_zero_or_denormal(a)) {
+ float_raise(float_flag_divbyzero, s);
+ return float32_set_sign(float32_infinity, float32_is_neg(a));
+ } else if (float32_is_neg(a)) {
+ float_raise(float_flag_invalid, s);
+ return float32_default_nan;
+ } else if (float32_is_infinity(a)) {
+ return float32_zero;
+ }
+
+ /* Normalize to a double-precision value between 0.25 and 1.0,
+ * preserving the parity of the exponent. */
+ if ((val & 0x800000) == 0) {
+ f64 = make_float64(((uint64_t)(val & 0x80000000) << 32)
+ | (0x3feULL << 52)
+ | ((uint64_t)(val & 0x7fffff) << 29));
+ } else {
+ f64 = make_float64(((uint64_t)(val & 0x80000000) << 32)
+ | (0x3fdULL << 52)
+ | ((uint64_t)(val & 0x7fffff) << 29));
+ }
+
+ result_exp = (380 - ((val & 0x7f800000) >> 23)) / 2;
+
+ f64 = recip_sqrt_estimate(f64, env);
+
+ val64 = float64_val(f64);
+
+ val = ((val64 >> 63) & 0x80000000)
+ | ((result_exp & 0xff) << 23)
+ | ((val64 >> 29) & 0x7fffff);
+ return make_float32(val);
}
uint32_t HELPER(recpe_u32)(uint32_t a, CPUState *env)
@@ -2780,13 +2873,23 @@ uint32_t HELPER(recpe_u32)(uint32_t a, CPUState *env)
uint32_t HELPER(rsqrte_u32)(uint32_t a, CPUState *env)
{
- float_status *s = &env->vfp.fp_status;
- float32 tmp;
- tmp = int32_to_float32(a, s);
- tmp = float32_scalbn(tmp, -32, s);
- tmp = helper_rsqrte_f32(tmp, env);
- tmp = float32_scalbn(tmp, 31, s);
- return float32_to_int32(tmp, s);
+ float64 f64;
+
+ if ((a & 0xc0000000) == 0) {
+ return 0xffffffff;
+ }
+
+ if (a & 0x80000000) {
+ f64 = make_float64((0x3feULL << 52)
+ | ((uint64_t)(a & 0x7fffffff) << 21));
+ } else { /* bits 31-30 == '01' */
+ f64 = make_float64((0x3fdULL << 52)
+ | ((uint64_t)(a & 0x3fffffff) << 22));
+ }
+
+ f64 = recip_sqrt_estimate(f64, env);
+
+ return 0x80000000 | ((float64_val(f64) >> 21) & 0x7fffffff);
}
void HELPER(set_teecr)(CPUState *env, uint32_t val)