1 files changed, 65 insertions, 0 deletions
diff --git a/src/test/mir-opt/if_condition_int.rs b/src/test/mir-opt/if_condition_int.rs
new file mode 100644
index 000000000..398311e6b
--- /dev/null
+++ b/src/test/mir-opt/if_condition_int.rs
@@ -0,0 +1,65 @@
+// unit-test: SimplifyComparisonIntegral
+// EMIT_MIR if_condition_int.opt_u32.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.opt_negative.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.opt_char.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.opt_i8.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.dont_opt_bool.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.opt_multiple_ifs.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.dont_remove_comparison.SimplifyComparisonIntegral.diff
+// EMIT_MIR if_condition_int.dont_opt_floats.SimplifyComparisonIntegral.diff
+
+fn opt_u32(x: u32) -> u32 {
+    if x == 42 { 0 } else { 1 }
+}
+
+// don't opt: it is already optimal to switch on the bool
+fn dont_opt_bool(x: bool) -> u32 {
+    if x { 0 } else { 1 }
+}
+
+fn opt_char(x: char) -> u32 {
+    if x == 'x' { 0 } else { 1 }
+}
+
+fn opt_i8(x: i8) -> u32 {
+    if x == 42 { 0 } else { 1 }
+}
+
+fn opt_negative(x: i32) -> u32 {
+    if x == -42 { 0 } else { 1 }
+}
+
+fn opt_multiple_ifs(x: u32) -> u32 {
+    if x == 42 {
+        0
+    } else if x != 21 {
+        1
+    } else {
+        2
+    }
+}
+
+// test that we optimize, but do not remove the b statement, as that is used later on
+fn dont_remove_comparison(a: i8) -> i32 {
+    let b = a == 17;
+    match b {
+        false => 10 + b as i32,
+        true => 100 + b as i32,
+    }
+}
+
+// test that we do not optimize on floats
+fn dont_opt_floats(a: f32) -> i32 {
+    if a == -42.0 { 0 } else { 1 }
+}
+
+fn main() {
+    opt_u32(0);
+    opt_char('0');
+    opt_i8(22);
+    dont_opt_bool(false);
+    opt_negative(0);
+    opt_multiple_ifs(0);
+    dont_remove_comparison(11);
+    dont_opt_floats(1.0);
+}