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home:dirkmueller:acdc:as_python3_module
postgresql12
0001-jit-Workaround-potential-datalayout-mismat...
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File 0001-jit-Workaround-potential-datalayout-mismatch-on-s390.patch of Package postgresql12
From 0edaa982336823d4d7af8f10b91579fe0099ef3d Mon Sep 17 00:00:00 2001 From: Tom Stellard <tstellar@redhat.com> Date: Tue, 20 Apr 2021 20:14:21 -0700 Subject: [PATCH] jit: Workaround potential datalayout mismatch on s390x LLVM's s390x target uses a different datalayout for z13 and newer processors. If llvmjit_types.bc is compiled to target a processor older than z13, and then the JIT runs on a z13 or newer processor, then there will be a mismatch in datalayouts between llvmjit_types.bc and the JIT engine. This mismatch causes the JIT to fail at runtime. --- src/backend/jit/llvm/llvmjit.c | 46 ++++++++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) --- src/backend/jit/llvm/llvmjit.c.orig +++ src/backend/jit/llvm/llvmjit.c @@ -736,6 +736,35 @@ llvm_compile_module(LLVMJitContext *cont } /* + * For the systemz target, LLVM uses a different datalayout for z13 and newer + * CPUs than it does for older CPUs. This can cause a mismatch in datalayouts + * in the case where the llvm_types_module is compiled with a pre-z13 CPU + * and the JIT is running on z13 or newer. + * See computeDataLayout() function in + * llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp for information on the + * datalayout differences. + */ +static bool +needs_systemz_workaround(void) +{ + bool ret = false; + LLVMContextRef llvm_context; + LLVMTypeRef vec_type; + LLVMTargetDataRef llvm_layoutref; + if (strncmp(LLVMGetTargetName(llvm_targetref), "systemz", strlen("systemz"))) + { + return false; + } + + llvm_context = LLVMGetModuleContext(llvm_types_module); + vec_type = LLVMVectorType(LLVMIntTypeInContext(llvm_context, 32), 4); + llvm_layoutref = LLVMCreateTargetData(llvm_layout); + ret = (LLVMABIAlignmentOfType(llvm_layoutref, vec_type) == 16); + LLVMDisposeTargetData(llvm_layoutref); + return ret; +} + +/* * Per session initialization. */ static void @@ -744,6 +773,7 @@ llvm_session_initialize(void) MemoryContext oldcontext; char *error = NULL; char *cpu = NULL; + char *host_features = NULL; char *features = NULL; LLVMTargetMachineRef opt0_tm; LLVMTargetMachineRef opt3_tm; @@ -775,10 +805,17 @@ llvm_session_initialize(void) * features not all CPUs have (weird, huh). */ cpu = LLVMGetHostCPUName(); - features = LLVMGetHostCPUFeatures(); + features = host_features = LLVMGetHostCPUFeatures(); elog(DEBUG2, "LLVMJIT detected CPU \"%s\", with features \"%s\"", cpu, features); + if (needs_systemz_workaround()) + { + const char *no_vector =",-vector"; + features = malloc(sizeof(char) * (strlen(host_features) + strlen(no_vector) + 1)); + sprintf(features, "%s%s", host_features, no_vector); + } + opt0_tm = LLVMCreateTargetMachine(llvm_targetref, llvm_triple, cpu, features, LLVMCodeGenLevelNone, @@ -792,8 +829,13 @@ llvm_session_initialize(void) LLVMDisposeMessage(cpu); cpu = NULL; - LLVMDisposeMessage(features); + if (features != host_features) + { + free(features); + } features = NULL; + LLVMDisposeMessage(host_features); + host_features = NULL; /* force symbols in main binary to be loaded */ LLVMLoadLibraryPermanently(NULL);
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