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PostgreSQLv14 TPC-H performance GCC vs Clang - Mailing list pgsql-performance

From arjun shetty
Subject PostgreSQLv14 TPC-H performance GCC vs Clang
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Msg-id CAMowxTu2S4BY4a4cRYyoyY8LqJWq1MPH+ACnzXu8H_AtBJxcTA@mail.gmail.com
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Responses Re: PostgreSQLv14 TPC-H performance GCC vs Clang  (Imre Samu <pella.samu@gmail.com>)
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Hi 
PostgreSQLv14 source code build  with GCCv11.2 and Clangv12(without JIT) with  optimisation flags like O3 and tested with HammerDB
Observed TPC-H , GCC performance better than Clang(without JIT). The performance difference ~22% and also noticed the assembly code difference GCC vs Clang( e.g. GCC inlined functionality compared to Clang). 

Environment details:
————————-
OS :RHEL8.4
Bare metal : Apple/AMD EPYC/IBM
Test(TPC-H) Benchmark Environment:HammerDB

Is the performance difference mainly because of below points ?
1 data over flow and calculations like int128(int128.c) and C arithmetic operations(functions include in float.h e.g float4_mul)   

And please suggest is any another functionality or code points need to check on the performance difference 

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