rustc: bzero in zero_alloca. Shaves off a second or three.

pcwalton · pcwalton · commit 4d180793f04e · 2011-08-04T16:33:38.000-07:00
diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs
@@ -5854,7 +5854,7 @@ fn zero_alloca(cx: &@block_ctxt, llptr: ValueRef, t: ty::t) -> result {
         bcx = call_bzero(llalign.bcx, llptr, llsz.val, llalign.val).bcx;
     } else {
         let llty = type_of(bcx_ccx(bcx), cx.sp, t);
-        bcx.build.Store(C_null(llty), llptr);
+        bcx = call_bzero(cx, llptr, llsize_of(llty), C_uint(1u)).bcx;
     }
     ret rslt(bcx, llptr);
 }

Original file line number	Diff line number	Diff line change
`@@ -5854,7 +5854,7 @@ fn zero_alloca(cx: &@block_ctxt, llptr: ValueRef, t: ty::t) -> result {`
`5854`	`5854`	`bcx = call_bzero(llalign.bcx, llptr, llsz.val, llalign.val).bcx;`
`5855`	`5855`	`} else {`
`5856`	`5856`	`let llty = type_of(bcx_ccx(bcx), cx.sp, t);`
`5857`		`- bcx.build.Store(C_null(llty), llptr);`
	`5857`	`+ bcx = call_bzero(cx, llptr, llsize_of(llty), C_uint(1u)).bcx;`
`5858`	`5858`	`}`
`5859`	`5859`	`ret rslt(bcx, llptr);`
`5860`	`5860`	`}`