inline: Round word-size cost estimates up

tmiasko · tmiasko · commit a65c0503332b · 2021-01-15T00:00:00.000Z
diff --git a/compiler/rustc_mir/src/transform/inline.rs b/compiler/rustc_mir/src/transform/inline.rs
@@ -382,7 +382,7 @@ impl Inliner<'tcx> {
             // Cost of the var is the size in machine-words, if we know
             // it.
             if let Some(size) = type_size_of(tcx, self.param_env, ty) {
-                cost += (size / ptr_size) as usize;
+                cost += ((size + ptr_size - 1) / ptr_size) as usize;
             } else {
                 cost += UNKNOWN_SIZE_COST;
             }

Original file line number	Diff line number	Diff line change
`@@ -382,7 +382,7 @@ impl Inliner<'tcx> {`
`382`	`382`	`// Cost of the var is the size in machine-words, if we know`
`383`	`383`	`// it.`
`384`	`384`	`if let Some(size) = type_size_of(tcx, self.param_env, ty) {`
`385`		`- cost += (size / ptr_size) as usize;`
	`385`	`+ cost += ((size + ptr_size - 1) / ptr_size) as usize;`
`386`	`386`	`} else {`
`387`	`387`	`cost += UNKNOWN_SIZE_COST;`
`388`	`388`	`}`