common : avoid unnecessary logits fetch (#8358)

diff --git a/common/sampling.cpp b/common/sampling.cpp
index 9f332fe5736838d58da96edfa8a39fb2ac4a2329..e9db2715f2649e0926a86cb809c93d1a6fafe3e0 100644 (file)
--- a/common/sampling.cpp
+++ b/common/sampling.cpp
@@ -282,8 +282,6 @@ static llama_token llama_sampling_sample_impl(
         GGML_ASSERT(!original_logits.empty());
     }
     llama_token id = 0;
-    // Get a pointer to the logits
-    float * logits = llama_get_logits_ith(ctx_main, idx);
 
     if (temp < 0.0) {
         // greedy sampling, with probs
@@ -324,6 +322,9 @@ static llama_token llama_sampling_sample_impl(
     }
 
     if (ctx_sampling->grammar != NULL && !is_resampling) {
+        // Get a pointer to the logits
+        float * logits = llama_get_logits_ith(ctx_main, idx);
+
         // Create an array with a single token data element for the sampled id
         llama_token_data single_token_data = {id, logits[id], 0.0f};
         llama_token_data_array single_token_data_array = { &single_token_data, 1, false };