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Commit27b57f8

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jit: Correct parameter type for generated expression evaluation functions.
clang only uses the 'i1' type for scalar booleans, not for pointers tobooleans (as the pointer might be pointing into a larger memoryallocation). Therefore a pointer-to-bool needs to the "storage" boolean.There's no known case of wrong code generation due to this, but it seems quitepossible that it could cause problems (see e.g.7255943).Author: Andres FreundDiscussion:https://postgr.es/m/20201207212142.wz5tnbk2jsaqzogb@alap3.anarazel.deBackpatch: 11-, where jit support was added
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‎src/backend/jit/llvm/llvmjit_expr.c

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -151,7 +151,7 @@ llvm_compile_expr(ExprState *state)
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param_types[0]=l_ptr(StructExprState);/* state */
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param_types[1]=l_ptr(StructExprContext);/* econtext */
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param_types[2]=l_ptr(TypeParamBool);/* isnull */
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param_types[2]=l_ptr(TypeStorageBool);/* isnull */
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eval_sig=LLVMFunctionType(TypeSizeT,
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param_types,lengthof(param_types),
@@ -258,8 +258,6 @@ llvm_compile_expr(ExprState *state)
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v_tmpvalue=LLVMBuildLoad(b,v_tmpvaluep,"");
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v_tmpisnull=LLVMBuildLoad(b,v_tmpisnullp,"");
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v_tmpisnull=
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LLVMBuildTrunc(b,v_tmpisnull,TypeParamBool,"");
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LLVMBuildStore(b,v_tmpisnull,v_isnullp);
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