[llvm] [WebAssembly] Fold unsigned offset (PR #145829)

[Luke Lau via llvm-commits]

================
@@ -60,6 +60,31 @@ define i32 @load_i32_with_folded_gep_offset_nuw(ptr %p) {
   ret i32 %t
 }
 
+ at global_data = hidden local_unnamed_addr global [12 x i8] c"Hello world\00", align 1
+
+define hidden signext i8 @global_load_i32_with_folded_gep_offset_nonconst_nuw(i32 noundef %idx) local_unnamed_addr {
+; CHECK-LABEL: global_load_i32_with_folded_gep_offset_nonconst_nuw:
+; CHECK:         .functype global_load_i32_with_folded_gep_offset_nonconst_nuw (i32) -> (i32)
+; CHECK:    i32.load8_s $push0=, global_data($0)
+; CHECK:    return $pop0
+entry:
+  %arrayidx = getelementptr inbounds nuw [12 x i8], ptr @global_data, i32 0, i32 %idx
+  %0 = load i8, ptr %arrayidx, align 1
+  ret i8 %0
----------------
lukel97 wrote:

Try to keep it to an i32 load to match the other tests

```suggestion
  %s = getelementptr nuw i32, ptr @global_data, i32 %idx
  %t = load i32, ptr %s
  ret i8 %t
```

https://github.com/llvm/llvm-project/pull/145829