From ead0824f65e7000d37e298c36e7292d4539d94f8 Mon Sep 17 00:00:00 2001
From: Anton <anton.frappe@outlook.com>
Date: Wed, 3 Mar 2021 16:20:07 +0100
Subject: [PATCH] bare1_6
---
examples/rtic_bare1.rs | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/examples/rtic_bare1.rs b/examples/rtic_bare1.rs
index 6a48f5d..b09d722 100644
--- a/examples/rtic_bare1.rs
+++ b/examples/rtic_bare1.rs
@@ -26,7 +26,7 @@ const APP: () = {
// prevent optimization by read-volatile (unsafe)
unsafe {
- core::ptr::read_volatile(&x);
+ //core::ptr::read_volatile(&x);
}
}
}
@@ -355,12 +355,17 @@ const APP: () = {
//
// Dump the generated assembly.
//
-// ** your answer here **
+// 0x08000240 <+0>: push {r7, lr}
+// 0x08000242 <+2>: mov r7, sp
+// => 0x08000244 <+4>: bkpt 0x0000
+// 0x08000246 <+6>: bkpt 0x0000
+// 0x08000248 <+8>: b.n 0x8000244 <rtic_bare1::init+4>
//
// Where is the local variable stored?
// What happened, and why is Rust + LLVM allowed to optimize out your code?
//
-// ** your answer here **
+// Since the local variable is no longer read then the compiler can
+// optimize away the variable.
//
// Commit your answers (bare1_6)
//
--
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