diff options
| -rw-r--r-- | llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp index 0c15941..0656960 100644 --- a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp +++ b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp @@ -1255,12 +1255,12 @@ Value *HWAddressSanitizer::getFrameRecordInfo(IRBuilder<> &IRB) { Value *PC = memtag::getPC(TargetTriple, IRB); Value *FP = getCachedFP(IRB); - // Mix SP and PC. + // Mix FP and PC. // Assumptions: // PC is 0x0000PPPPPPPPPPPP (48 bits are meaningful, others are zero) - // SP is 0xsssssssssssSSSS0 (4 lower bits are zero) - // We only really need ~20 lower non-zero bits (SSSS), so we mix like this: - // 0xSSSSPPPPPPPPPPPP + // FP is 0xfffffffffffFFFF0 (4 lower bits are zero) + // We only really need ~20 lower non-zero bits (FFFF), so we mix like this: + // 0xFFFFPPPPPPPPPPPP FP = IRB.CreateShl(FP, 44); return IRB.CreateOr(PC, FP); } |