[llvm] [WebAssembly] Optimize lowering of constant-sized memcpy and memset (PR #163294)

[Derek Schuff via llvm-commits]

================
@@ -224,17 +225,11 @@ define void @memcpy_alloca_src(ptr %dst) {
 ; BULK-MEM-NEXT: .functype memcpy_alloca_dst (i32) -> ()
 ; BULK-MEM-NEXT: global.get $push[[L0:[0-9]+]]=, __stack_pointer
 ; BULK-MEM-NEXT: i32.const $push[[L1:[0-9]+]]=, 112
-; BULK-MEM-NEXT: i32.sub $[[L2:[0-9]+]]=, $pop[[L0]], $pop[[L1]]
-; BULK-MEM-NEXT: block
-; BULK-MEM-NEXT: i32.const $push[[L3:[0-9]+]]=, 100
-; BULK-MEM-NEXT: i32.eqz $push[[L4:[0-9]+]]=, $pop[[L3]]
-; BULK-MEM-NEXT: br_if 0, $pop[[L4]]
-; BULK-MEM-NEXT: i32.const $push[[L5:[0-9]+]]=, 12
-; BULK-MEM-NEXT: i32.add $push[[L6:[0-9]+]]=, $[[L2]], $pop[[L5]]
-; BULK-MEM-NEXT: i32.const $push[[L7:[0-9]+]]=, 100
-; BULK-MEM-NEXT: memory.copy 0, 0, $pop[[L6]], $0, $pop[[L7]]
-; BULK-MEM-NEXT: .LBB{{.*}}:
-; BULK-MEM-NEXT: end_block
+; BULK-MEM-NEXT: i32.sub $push[[L2:[0-9]+]]=, $pop[[L0]], $pop[[L1]]
+; BULK-MEM-NEXT: i32.const $push[[L4:[0-9]+]]=, 12
+; BULK-MEM-NEXT: i32.add $push[[L5:[0-9]+]]=, $pop[[L2]], $pop[[L4]]
+; BULK-MEM-NEXT: i32.const $push[[L6:[0-9]+]]=, 100
+; BULK-MEM-NEXT: memory.copy 0, 0, $pop[[L5]], $0, $pop[[L6]]
----------------
dschuff wrote:

Oops, yeah I guess that's what happens when you don't autogenerate your test cases.

https://github.com/llvm/llvm-project/pull/163294