Fixes for exp and log functions

- Fixed how logarithm2() handles infinity - Fixed a typo in exponential() These fixes combined fix all dEQP failures for: sinh, cosh, pow, exp, log, log2 Change-Id: I2d427892032fc5f75909a5609f606a787b08505a Reviewed-on: https://swiftshader-review.googlesource.com/13708Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Fixes for exp and log functions
0b7003bd · Alexis Hetu · Alexis Hétu · 8ef6d109 · 0b7003bd
Commit 0b7003bd authored Nov 13, 2017 by Alexis Hetu Committed by Alexis Hétu Nov 14, 2017
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ShaderCore.cpp src/Shader/ShaderCore.cpp +3 -2

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--- a/src/Shader/ShaderCore.cpp
+++ b/src/Shader/ShaderCore.cpp
@@ -166,13 +166,14 @@ namespace sw

 		x1 += (x0 - Float4(1.0f)) * x2;

-		return x1;
+		Int4 pos_inf_x = CmpEQ(As<Int4>(x), Int4(0x7F800000));
+		return As<Float4>((pos_inf_x & As<Int4>(x)) | (~pos_inf_x & As<Int4>(x1)));
 	}

 	Float4 exponential(RValue<Float4> x, bool pp)
 	{
 		// FIXME: Propagate the constant
-		return exponential2(Float4(1.44269541f) * x, pp);   // 1/ln(2)
+		return exponential2(Float4(1.44269504f) * x, pp);   // 1/ln(2)
 	}

 	Float4 logarithm(RValue<Float4> x, bool absolute, bool pp)