From 7a4dad7e87bd5561bbe62f5d38fda1b968f9d529 Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Thu, 15 Apr 2021 18:17:31 +0200
Subject: [PATCH] stage1: More precise serialization of f16 values

Taking a detour trough a f64 is dangerous as the softfloat library
doesn't like converting sNaN values.

The error went unnoticed as an exception is raised by the library but
the stage1 compiler doesn't give a damn.
---
 src/stage1/codegen.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/stage1/codegen.cpp b/src/stage1/codegen.cpp
index 6d219c517d..3bb1a7e022 100644
--- a/src/stage1/codegen.cpp
+++ b/src/stage1/codegen.cpp
@@ -7436,7 +7436,10 @@ static LLVMValueRef gen_const_val(CodeGen *g, ZigValue *const_val, const char *n
         case ZigTypeIdFloat:
             switch (type_entry->data.floating.bit_count) {
                 case 16:
-                    return LLVMConstReal(get_llvm_type(g, type_entry), zig_f16_to_double(const_val->data.x_f16));
+                    {
+                        LLVMValueRef as_int = LLVMConstInt(LLVMInt16Type(), const_val->data.x_f16.v, false);
+                        return LLVMConstBitCast(as_int, get_llvm_type(g, type_entry));
+                    }
                 case 32:
                     return LLVMConstReal(get_llvm_type(g, type_entry), const_val->data.x_f32);
                 case 64: