[WebAssembly] Mark COPY_LOCAL and TEE_LOCAL instructions has having no side effects.

llvm-svn: 269683

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
index a0ec3698aa5..4b319871cf1 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
@@ -110,6 +110,7 @@ let Defs = [ARGUMENTS] in {
 // get_local and set_local are not generated by instruction selection; they
 // are implied by virtual register uses and defs.
 multiclass LOCAL<WebAssemblyRegClass vt> {
+let hasSideEffects = 0 in {
   // COPY_LOCAL is not an actual instruction in wasm, but since we allow
   // get_local and set_local to be implicit, we can have a COPY_LOCAL which
   // is actually a no-op because all the work is done in the implied
@@ -124,6 +125,7 @@ multiclass LOCAL<WebAssemblyRegClass vt> {
   let isAsCheapAsAMove = 1 in
   def TEE_LOCAL_#vt : I<(outs vt:$res, vt:$also), (ins vt:$src), [],
                         "tee_local\t$res, $also, $src">;
+} // hasSideEffects = 0
 }
 defm : LOCAL<I32>;
 defm : LOCAL<I64>;