Revert "ggml: move ggml_table_f32_f16 to ggml-cpu"

This reverts commit 9e40d98.

Signed-off-by: Aaron Teo <[email protected]>

Author: taronaeo

ggml/src/ggml-cpu/ggml-cpu.c

@@ -3479,7 +3479,6 @@ void ggml_cpu_init(void) {
                     ggml_fp16_t fp16;
                 } u = {i};
                 float f = GGML_CPU_FP16_TO_FP32(u.fp16);
-                ggml_table_f32_f16[i] = GGML_COMPUTE_FP16_TO_FP32(u.fp16);
                 ggml_table_gelu_f16[i] = GGML_CPU_FP32_TO_FP16(ggml_gelu_f32(f));
                 ggml_table_gelu_quick_f16[i] = GGML_CPU_FP32_TO_FP16(ggml_gelu_quick_f32(f));
             }

ggml/src/ggml-cpu/simd-mappings.h

@@ -137,10 +137,6 @@
     }
 #endif
 
-// precomputed f32 table for f16 (256 KB)
-// defined in ggml.c, initialized in ggml_init()
-GGML_API float ggml_table_f32_f16[1 << 16];
-
 // On ARM NEON, it's quicker to directly convert x -> x instead of calling into ggml_lookup_fp16_to_fp32,
 // so we define GGML_CPU_FP16_TO_FP32 and GGML_CPU_FP32_TO_FP16 elsewhere for NEON.
 // This is also true for POWER9.

ggml/src/ggml-impl.h

@@ -393,6 +393,10 @@ static inline ggml_fp16_t ggml_compute_fp32_to_fp16(float f) {
 #define GGML_FP16_TO_FP32(x) GGML_COMPUTE_FP16_TO_FP32(x)
 #define GGML_FP32_TO_FP16(x) GGML_COMPUTE_FP32_TO_FP16(x)
 
+// precomputed f32 table for f16 (256 KB)
+// defined in ggml.c, initialized in ggml_init()
+GGML_API float ggml_table_f32_f16[1 << 16];
+
 /**
  * Converts brain16 to float32.
  *

ggml/src/ggml.c

@@ -1414,6 +1414,27 @@ static inline bool ggml_can_repeat_rows(const struct ggml_tensor * t0, const str
 ////////////////////////////////////////////////////////////////////////////////
 
 struct ggml_context * ggml_init(struct ggml_init_params params) {
+    static bool is_first_call = true;
+
+    ggml_critical_section_start();
+
+    if (is_first_call) {
+        // initialize time system (required on Windows)
+        ggml_time_init();
+
+        for (int i = 0; i < (1 << 16); ++i) {
+            union {
+                uint16_t u16;
+                ggml_fp16_t fp16;
+            } u = {i};
+            ggml_table_f32_f16[i] = GGML_COMPUTE_FP16_TO_FP32(u.fp16);
+        }
+
+        is_first_call = false;
+    }
+
+    ggml_critical_section_end();
+
     struct ggml_context * ctx = GGML_MALLOC(sizeof(struct ggml_context));
 
     // allow to call ggml_init with 0 size