[WebAssembly] Use "long long" for int_fast64_t and int_least64_t on wasm64

This makes int_fast64_t and int_least64_t the same type as int64_t, and
eliminates a difference between wasm32 and wasm64.

Differential Revision: http://reviews.llvm.org/D12861

llvm-svn: 247622

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 16593b9b224..2007f01c2ad 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -7069,6 +7069,19 @@ private:
   const char *getClobbers() const final { return ""; }
   bool isCLZForZeroUndef() const final { return false; }
   bool hasInt128Type() const final { return true; }
+  IntType getIntTypeByWidth(unsigned BitWidth,
+                            bool IsSigned) const final {
+    // WebAssembly prefers long long for explicitly 64-bit integers.
+    return BitWidth == 64 ? (IsSigned ? SignedLongLong : UnsignedLongLong)
+                          : TargetInfo::getIntTypeByWidth(BitWidth, IsSigned);
+  }
+  IntType getLeastIntTypeByWidth(unsigned BitWidth,
+                                 bool IsSigned) const final {
+    // WebAssembly uses long long for int_least64_t and int_fast64_t.
+    return BitWidth == 64
+               ? (IsSigned ? SignedLongLong : UnsignedLongLong)
+               : TargetInfo::getLeastIntTypeByWidth(BitWidth, IsSigned);
+  }
 };
 
 const Builtin::Info WebAssemblyTargetInfo::BuiltinInfo[] = {