[WebAssembly] Fix fast-isel lowering illegal argument and return types.

For both argument and return types, promote illegal types like i24 to i32,
and if a type can't be easily promoted, clear out the signature before
bailing out, so avoid leaving it in a partially complete state.

Fixes PR37546.

llvm-svn: 332947

1 files changed, 33 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/WebAssembly/fast-isel-i256.ll b/llvm/test/CodeGen/WebAssembly/fast-isel-i256.ll
new file mode 100644
index 00000000000..a30ea353701
--- /dev/null
+++ b/llvm/test/CodeGen/WebAssembly/fast-isel-i256.ll
@@ -0,0 +1,33 @@
+; RUN: llc < %s -O0
+; PR36564
+; PR37546
+
+; Test that fast-isel properly copes with i256 arguments and return types.
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+; CHECK-LABEL: add:
+; CHECK-NEXT: .param      i32, i64, i64, i64, i64, i64, i64, i64, i64{{$}}
+; CHECK-NOT:  .result
+; CHECK: end_function
+define i256 @add(i256 %x, i256 %y) {
+    %z = add i256 %x, %y
+    ret i256 %z
+}
+
+; CHECK-LABEL: return_zero:
+; CHECK-NEXT: .param      i32{{$}}
+; CHECK-NOT: .result
+; CHECK: end_function
+define i256 @return_zero() {
+    ret i256 0
+}
+
+; CHECK-LABEL: return_zero_with_params:
+; CHECK-NEXT: .param      i32, f32{{$}}
+; CHECK-NOT: .result
+; CHECK: end_function
+define i256 @return_zero_with_params(float %x) {
+    ret i256 0
+}