[WebAssembly] Support f16 libcalls

Add support for f16 libcalls in WebAssembly. This entails adding signatures
for the remaining F16 libcalls, and renaming gnu_f2h_ieee/gnu_h2f_ieee to
truncsfhf2/extendhfsf2 for consistency between f32 and f64/f128 (compiler-rt
already supports this).

Differential Revision: https://reviews.llvm.org/D61287

Reviewer: dschuff
llvm-svn: 359600

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 105b1360ac2..3d805344483 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -271,6 +271,11 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
     MaxStoresPerMemsetOptSize = 1;
   }
 
+  // Override the __gnu_f2h_ieee/__gnu_h2f_ieee names so that the f32 name is
+  // consistent with the f64 and f128 names.
+  setLibcallName(RTLIB::FPEXT_F16_F32, "__extendhfsf2");
+  setLibcallName(RTLIB::FPROUND_F32_F16, "__truncsfhf2");
+
   // Always convert switches to br_tables unless there is only one case, which
   // is equivalent to a simple branch. This reduces code size for wasm, and we
   // defer possible jump table optimizations to the VM.