From d3331fba6eaab44646010b556106da38925d43e0 Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Thu, 6 Feb 2020 14:31:09 -0500
Subject: 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.
---
 source/core/slang-math.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'source/core')

diff --git a/source/core/slang-math.h b/source/core/slang-math.h
index 0daad0d5a..fa7eea6be 100644
--- a/source/core/slang-math.h
+++ b/source/core/slang-math.h
@@ -5,6 +5,13 @@
 
 namespace Slang
 {
+    // Some handy constants
+
+    // The largest positive (or negative) number 
+#   define SLANG_HALF_MAX 65504.0f
+    // Smallest (denormalized) value. 1 / 2^24
+#   define SLANG_HALF_SUB_NORMAL_MIN (1.0f / 16777216.0f)
+
 	class Math
 	{
 	public:
@@ -20,6 +27,13 @@ namespace Slang
 
         
 		static const float Pi;
+
+        template <typename T>
+        static T Abs(T a)
+        {
+            return (a < 0) ? -a : a;
+        }
+
 		template<typename T>
 		static T Min(const T& v1, const T&v2)
 		{
-- 
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