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Re: [PATCH v5 39/60] target/riscv: vector floating-point classify instru


From: LIU Zhiwei
Subject: Re: [PATCH v5 39/60] target/riscv: vector floating-point classify instructions
Date: Sat, 14 Mar 2020 17:15:23 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0



On 2020/3/14 17:10, Richard Henderson wrote:
On 3/12/20 7:58 AM, LIU Zhiwei wrote:
+/* Vector Floating-Point Classify Instruction */
+static uint16_t fclass_f16(uint16_t frs1, float_status *s)
+{
+    float16 f = frs1;
+    bool sign = float16_is_neg(f);
+
+    if (float16_is_infinity(f)) {
+        return sign ? 1 << 0 : 1 << 7;
+    } else if (float16_is_zero(f)) {
+        return sign ? 1 << 3 : 1 << 4;
+    } else if (float16_is_zero_or_denormal(f)) {
+        return sign ? 1 << 2 : 1 << 5;
+    } else if (float16_is_any_nan(f)) {
+        float_status s = { }; /* for snan_bit_is_one */
+        return float16_is_quiet_nan(f, &s) ? 1 << 9 : 1 << 8;
+    } else {
+        return sign ? 1 << 1 : 1 << 6;
+    }
+}
+static uint32_t fclass_s(uint32_t frs1, float_status *s)
+{
+    float32 f = frs1;
+    bool sign = float32_is_neg(f);
+
+    if (float32_is_infinity(f)) {
+        return sign ? 1 << 0 : 1 << 7;
+    } else if (float32_is_zero(f)) {
+        return sign ? 1 << 3 : 1 << 4;
+    } else if (float32_is_zero_or_denormal(f)) {
+        return sign ? 1 << 2 : 1 << 5;
+    } else if (float32_is_any_nan(f)) {
+        float_status s = { }; /* for snan_bit_is_one */
+        return float32_is_quiet_nan(f, &s) ? 1 << 9 : 1 << 8;
+    } else {
+        return sign ? 1 << 1 : 1 << 6;
+    }
+}
+static uint64_t fclass_d(uint64_t frs1, float_status *s)
+{
+    float64 f = frs1;
+    bool sign = float64_is_neg(f);
+
+    if (float64_is_infinity(f)) {
+        return sign ? 1 << 0 : 1 << 7;
+    } else if (float64_is_zero(f)) {
+        return sign ? 1 << 3 : 1 << 4;
+    } else if (float64_is_zero_or_denormal(f)) {
+        return sign ? 1 << 2 : 1 << 5;
+    } else if (float64_is_any_nan(f)) {
+        float_status s = { }; /* for snan_bit_is_one */
+        return float64_is_quiet_nan(f, &s) ? 1 << 9 : 1 << 8;
+    } else {
+        return sign ? 1 << 1 : 1 << 6;
+    }
+}
These need to be moved out of fpu_helper.c so they can be shared.
I will add an internals.h and move the declaration to internals.h.

Zhiwei


r~




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