coverage: Enable branch coverage in the branch coverage tests

Author: Zalathar

tests/coverage/branch_generics.cov-map

@@ -1,43 +1,52 @@
 Function name: branch_generics::print_size::<()>
-Raw bytes (28): 0x[01, 01, 02, 01, 05, 05, 02, 04, 01, 06, 01, 01, 24, 05, 01, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 2
 - expression 0 operands: lhs = Counter(0), rhs = Counter(1)
 - expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
-Number of file 0 mappings: 4
+Number of file 0 mappings: 5
 - Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
-- Code(Counter(1)) at (prev + 1, 37) to (start + 2, 6)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
 - Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
     = (c0 - c1)
 - Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c1 + (c0 - c1))
 
 Function name: branch_generics::print_size::<u32>
-Raw bytes (28): 0x[01, 01, 02, 01, 05, 05, 02, 04, 01, 06, 01, 01, 24, 05, 01, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 2
 - expression 0 operands: lhs = Counter(0), rhs = Counter(1)
 - expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
-Number of file 0 mappings: 4
+Number of file 0 mappings: 5
 - Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
-- Code(Counter(1)) at (prev + 1, 37) to (start + 2, 6)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
 - Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
     = (c0 - c1)
 - Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)
     = (c1 + (c0 - c1))
 
 Function name: branch_generics::print_size::<u64>
-Raw bytes (28): 0x[01, 01, 02, 01, 05, 05, 02, 04, 01, 06, 01, 01, 24, 05, 01, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
 Number of files: 1
 - file 0 => global file 1
 Number of expressions: 2
 - expression 0 operands: lhs = Counter(0), rhs = Counter(1)
 - expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
-Number of file 0 mappings: 4
+Number of file 0 mappings: 5
 - Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
-- Code(Counter(1)) at (prev + 1, 37) to (start + 2, 6)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
 - Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
     = (c0 - c1)
 - Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)

tests/coverage/branch_generics.coverage

@@ -1,10 +1,15 @@
    LL|       |#![feature(coverage_attribute)]
    LL|       |//@ edition: 2021
-   LL|       |
+   LL|       |//@ compile-flags: -Zunstable-options -Cinstrument-coverage=branch
    LL|       |//@ llvm-cov-flags: --show-branches=count
    LL|       |
    LL|      3|fn print_size<T>() {
    LL|      3|    if std::mem::size_of::<T>() > 4 {
+  ------------------
+  |  Branch (LL:8): [True: 0, False: 1]
+  |  Branch (LL:8): [True: 0, False: 1]
+  |  Branch (LL:8): [True: 1, False: 0]
+  ------------------
    LL|      1|        println!("size > 4");
    LL|      2|    } else {
    LL|      2|        println!("size <= 4");
@@ -14,6 +19,9 @@
   | branch_generics::print_size::<()>:
   |   LL|      1|fn print_size<T>() {
   |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 0, False: 1]
+  |  ------------------
   |   LL|      0|        println!("size > 4");
   |   LL|      1|    } else {
   |   LL|      1|        println!("size <= 4");
@@ -23,6 +31,9 @@
   | branch_generics::print_size::<u32>:
   |   LL|      1|fn print_size<T>() {
   |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 0, False: 1]
+  |  ------------------
   |   LL|      0|        println!("size > 4");
   |   LL|      1|    } else {
   |   LL|      1|        println!("size <= 4");
@@ -32,6 +43,9 @@
   | branch_generics::print_size::<u64>:
   |   LL|      1|fn print_size<T>() {
   |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 1, False: 0]
+  |  ------------------
   |   LL|      1|        println!("size > 4");
   |   LL|      1|    } else {
   |   LL|      0|        println!("size <= 4");

tests/coverage/branch_generics.rs

@@ -1,6 +1,6 @@
 #![feature(coverage_attribute)]
 //@ edition: 2021
-
+//@ compile-flags: -Zunstable-options -Cinstrument-coverage=branch
 //@ llvm-cov-flags: --show-branches=count
 
 fn print_size<T>() {