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JIT tuple deforming in LLVM JIT provider.

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Performing JIT compilation for deforming gains performance benefits
over unJITed deforming from compile-time knowledge of the tuple
descriptor. Fixed column widths, NOT NULLness, etc can be taken
advantage of.

Right now the JITed deforming is only used when deforming tuples as
part of expression evaluation (and obviously only if the descriptor is
known). It's likely to be beneficial in other cases, too.

By default tuple deforming is JITed whenever an expression is JIT
compiled. There's a separate boolean GUC controlling it, but that's
expected to be primarily useful for development and benchmarking.

Docs will follow in a later commit containing docs for the whole JIT
feature.

Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-03-26 12:57:19 -07:00
parent 64f85894ad
commit 32af96b2b1
17 changed files with 827 additions and 3 deletions
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3
src/include/jit/llvmjit.h
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@ -32,6 +32,7 @@ extern "C"
#include "fmgr.h"
#include "jit/jit.h"
#include "nodes/pg_list.h"
#include "access/tupdesc.h"
typedef struct LLVMJitContext
@ -75,6 +76,7 @@ extern LLVMTypeRef StructAggStatePerGroupData;
extern LLVMValueRef AttributeTemplate;
extern LLVMValueRef FuncStrlen;
extern LLVMValueRef FuncVarsizeAny;
extern LLVMValueRef FuncSlotGetsomeattrs;
extern LLVMValueRef FuncHeapGetsysattr;
extern LLVMValueRef FuncMakeExpandedObjectReadOnlyInternal;
@ -107,6 +109,7 @@ extern LLVMValueRef llvm_function_reference(LLVMJitContext *context,
****************************************************************************
*/
extern bool llvm_compile_expr(struct ExprState *state);
extern LLVMValueRef slot_compile_deform(struct LLVMJitContext *context, TupleDesc desc, int natts);
/*
****************************************************************************