Literal handling improvements (#1202)

* WIP: 64 literal diagnostic and truncation.

* Improve how integer truncation is handled/supported.
Added literal-int64.slang test.
Set a suffix on all literals.
Fixed problem on C++ based targets where l suffix was not the same as int() cast. So on C++ derived emitters, int() is used instead of l suffix to have same behavior across targets.

* Add literal diagnostic testing.

* Allow lexer to lex - in front of literals.

* Fix lexing and converting int literal with -.

* Too large small values of floats become inf.
Handling writing inf types out on different targets.
Add function to deterimine if a float literals kind.

* Roll back the support of lexer lexing negative literals.

* Fixed tests broken because of diagnostics numbers.
Improved _isFinite

* Fix compilation on linux.

* Fix problem with abs on linux - use Math::Abs.

* Fix typo.

* * Improve warnings for float literals zeroed
* Improved 64 bit type documentation
* Handle half
* Improved comments
* Fixed tests broken
* Use capital letters for suffixes.

* Make default behavior on outputting a int literal that is an 'int32_t' is cast (not suffix) to avoid platform inconsistencies.
Improve documentation for 64 bit types.
Make tests cover material in docs.

* Fixed tests.

* Rename FloatKind::Normal -> Finite

* Fix half zero check.

1 files changed, 36 insertions, 0 deletions

diff --git a/source/slang/slang-emit-hlsl.cpp b/source/slang/slang-emit-hlsl.cpp
index 240ef6ad0..f615d41fb 100644
--- a/source/slang/slang-emit-hlsl.cpp
+++ b/source/slang/slang-emit-hlsl.cpp
@@ -488,6 +488,42 @@ void HLSLSourceEmitter::emitVectorTypeNameImpl(IRType* elementType, IRIntegerVal
     m_writer->emit(">");
 }
 
+void HLSLSourceEmitter::emitSimpleValueImpl(IRInst* inst)
+{
+    switch (inst->op)
+    {
+        case kIROp_FloatLit:
+        {
+            IRConstant* constantInst = static_cast<IRConstant*>(inst);
+            IRConstant::FloatKind kind = constantInst->getFloatKind();
+            switch (kind)
+            {
+                case IRConstant::FloatKind::Nan:
+                {
+                    m_writer->emit("(0.0 / 0.0)");
+                    return;
+                }
+                case IRConstant::FloatKind::PositiveInfinity:
+                {
+                    m_writer->emit("(1.0 / 0.0)");
+                    return;
+                }
+                case IRConstant::FloatKind::NegativeInfinity:
+                {
+                    m_writer->emit("(-1.0 / 0.0)");
+                    return;
+                }
+                default: break;
+            }
+            break;
+        }
+
+        default: break;
+    }
+
+    Super::emitSimpleValueImpl(inst);
+}
+
 void HLSLSourceEmitter::emitSimpleTypeImpl(IRType* type)
 {
     switch (type->op)