[WebAssembly] Don't abort on code with UB.
Gracefully leave code that performs function-pointer bitcasts implying
non-trivial pointer conversions alone, rather than aborting, since it's
just undefined behavior.
llvm-svn: 291326
diff --git a/llvm/test/CodeGen/WebAssembly/unsupported-function-bitcasts.ll b/llvm/test/CodeGen/WebAssembly/unsupported-function-bitcasts.ll
new file mode 100644
index 0000000..ef4318e
--- /dev/null
+++ b/llvm/test/CodeGen/WebAssembly/unsupported-function-bitcasts.ll
@@ -0,0 +1,26 @@
+; RUN: llc < %s -asm-verbose=false | FileCheck %s
+
+; Test that function pointer casts that require conversions are not converted
+; to wrappers. In theory some conversions could be supported, but currently no
+; conversions are implemented.
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+; CHECK-LABEL: test:
+; CHECK-NEXT: i32.const $push[[L0:[0-9]+]]=, 0{{$}}
+; CHECK-NEXT: call has_i64_arg@FUNCTION, $pop[[L0]]{{$}}
+; CHECK-NEXT: i32.call $drop=, has_i64_ret@FUNCTION{{$}}
+; CHECK-NEXT: .endfunc
+
+; CHECK-NOT: .Lbitcast
+
+declare void @has_i64_arg(i64)
+declare i64 @has_i64_ret()
+
+define void @test() {
+entry:
+ call void bitcast (void (i64)* @has_i64_arg to void (i32)*)(i32 0)
+ %t = call i32 bitcast (i64 ()* @has_i64_ret to i32 ()*)()
+ ret void
+}