use if let to avoid potential div by zero

remove semicolon -_-

Add rem_bytes to conditional to avoid error when performing mod by 0

Add test file to confirm compilation passes.

Ensure we don't divide or mod by zero in llvm_type. Include test file from issue.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/librustc_codegen_llvm/abi.rs b/src/librustc_codegen_llvm/abi.rs
index 25c598c532c..221012903d9 100644
--- a/src/librustc_codegen_llvm/abi.rs
+++ b/src/librustc_codegen_llvm/abi.rs
@@ -127,8 +127,12 @@ impl LlvmType for Reg {
 impl LlvmType for CastTarget {
     fn llvm_type(&self, cx: &CodegenCx) -> Type {
         let rest_ll_unit = self.rest.unit.llvm_type(cx);
-        let rest_count = self.rest.total.bytes() / self.rest.unit.size.bytes();
-        let rem_bytes = self.rest.total.bytes() % self.rest.unit.size.bytes();
+        let (rest_count, rem_bytes) = if self.rest.unit.size.bytes() == 0 {
+            (0, 0)
+        } else {
+            (self.rest.total.bytes() / self.rest.unit.size.bytes(),
+            self.rest.total.bytes() % self.rest.unit.size.bytes())
+        };
 
         if self.prefix.iter().all(|x| x.is_none()) {
             // Simplify to a single unit when there is no prefix and size <= unit size