Speedup bytecode-gen by applying an upper bound on read_exact (Fuel…

…Labs#3096)
titiloba · Oct 22, 2022 · 9418b83 · 9418b83
1 parent aaf7c88
commit 9418b83
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/sway-core/src/asm_generation/finalized_asm.rs b/sway-core/src/asm_generation/finalized_asm.rs
@@ -131,7 +131,9 @@ fn to_bytecode_mut(
                     if let Some(span) = &span {
                         source_map.insert(half_word_ix, span);
                     }
-                    op.read_exact(&mut buf[half_word_ix * 4..])
+                    let read_range_upper_bound =
+                        core::cmp::min(half_word_ix * 4 + std::mem::size_of_val(&op), buf.len());
+                    op.read_exact(&mut buf[half_word_ix * 4..read_range_upper_bound])
                         .expect("Failed to write to in-memory buffer.");
                     half_word_ix += 1;
                 }