[llvm] c0db240 - AMDGPU: Document denormal behavior

[Matt Arsenault via llvm-commits]

Author: Matt Arsenault
Date: 2023-02-24T07:41:29-04:00
New Revision: c0db240e5167885cc8083d72db85c80f5b7eb936

URL: https://github.com/llvm/llvm-project/commit/c0db240e5167885cc8083d72db85c80f5b7eb936
DIFF: https://github.com/llvm/llvm-project/commit/c0db240e5167885cc8083d72db85c80f5b7eb936.diff

LOG: AMDGPU: Document denormal behavior

Not sure this is the right place for it next to the table.

Added: 
    

Modified: 
    llvm/docs/AMDGPUUsage.rst

Removed: 
    


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diff  --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst
index f8ea82876ab2..fc7029bd1477 100644
--- a/llvm/docs/AMDGPUUsage.rst
+++ b/llvm/docs/AMDGPUUsage.rst
@@ -4623,6 +4623,10 @@ The fields used by CP for code objects before V3 also match those specified in
      FLOAT_DENORM_MODE_FLUSH_NONE           3     No Flush
      ====================================== ===== ==============================
 
+     Denormal flushing is sign respecting. i.e. the behavior expected
+     by ``"denormal-fp-math"="preserve-sign"``. The behavior is
+     undefined with ``"denormal-fp-math"="positive-zero"``
+
 ..
 
   .. table:: System VGPR Work-Item ID Enumeration Values