[X86] Add an Unoptimized Load Value Injection (LVI) Load Hardening Pass

@nikic raised an issue on D75936 that the added complexity to the O0 pipeline was causing noticeable slowdowns for `-O0` builds. This patch addresses the issue by adding a pass with equal security properties, but without any optimizations (and more importantly, without the need for expensive analysis dependencies).

Reviewers: nikic, craig.topper, mattdr

Reviewed By: craig.topper, mattdr

Differential Revision: https://reviews.llvm.org/D80964

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86.h b/llvm/lib/Target/X86/X86.h
index 39b2f814def..a0ab5c3a5b3 100644
--- a/llvm/lib/Target/X86/X86.h
+++ b/llvm/lib/Target/X86/X86.h
@@ -134,6 +134,7 @@ InstructionSelector *createX86InstructionSelector(const X86TargetMachine &TM,
                                                   X86RegisterBankInfo &);
 
 FunctionPass *createX86LoadValueInjectionLoadHardeningPass();
+FunctionPass *createX86LoadValueInjectionLoadHardeningUnoptimizedPass();
 FunctionPass *createX86LoadValueInjectionRetHardeningPass();
 FunctionPass *createX86SpeculativeLoadHardeningPass();
 
@@ -150,6 +151,7 @@ void initializeX86DomainReassignmentPass(PassRegistry &);
 void initializeX86ExecutionDomainFixPass(PassRegistry &);
 void initializeX86ExpandPseudoPass(PassRegistry &);
 void initializeX86FlagsCopyLoweringPassPass(PassRegistry &);
+void initializeX86LoadValueInjectionLoadHardeningUnoptimizedPassPass(PassRegistry &);
 void initializeX86LoadValueInjectionLoadHardeningPassPass(PassRegistry &);
 void initializeX86LoadValueInjectionRetHardeningPassPass(PassRegistry &);
 void initializeX86OptimizeLEAPassPass(PassRegistry &);