[WebAssembly] Fix legalization of shift operators on large integer types.
llvm-svn: 255847
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 2364366..ed7cb19 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -207,6 +207,13 @@
unsigned BitWidth = NextPowerOf2(VT.getSizeInBits() - 1);
if (BitWidth > 1 && BitWidth < 8)
BitWidth = 8;
+
+ if (BitWidth > 64) {
+ BitWidth = 64;
+ assert(BitWidth >= Log2_32_Ceil(VT.getSizeInBits()) &&
+ "64-bit shift counts ought to be enough for anyone");
+ }
+
MVT Result = MVT::getIntegerVT(BitWidth);
assert(Result != MVT::INVALID_SIMPLE_VALUE_TYPE &&
"Unable to represent scalar shift amount type");