From cdca0730be2af252d1498b752d489bdcbb054681 Mon Sep 17 00:00:00 2001 From: Dean Michael Berris Date: Thu, 1 Feb 2018 02:21:54 +0000 Subject: [XRay][compiler-rt+llvm] Update XRay register stashing semantics Summary: This change expands the amount of registers stashed by the entry and `__xray_CustomEvent` trampolines. We've found that since the `__xray_CustomEvent` trampoline calls can show up in situations where the scratch registers are being used, and since we don't typically want to affect the code-gen around the disabled `__xray_customevent(...)` intrinsic calls, that we need to save and restore the state of even the scratch registers in the handling of these custom events. Reviewers: pcc, pelikan, dblaikie, eizan, kpw, echristo, chandlerc Reviewed By: echristo Subscribers: chandlerc, echristo, hiraditya, davide, dblaikie, llvm-commits Differential Revision: https://reviews.llvm.org/D40894 llvm-svn: 323940 --- llvm/lib/CodeGen/SelectionDAG/FastISel.cpp | 1 + 1 file changed, 1 insertion(+) (limited to 'llvm/lib/CodeGen/SelectionDAG/FastISel.cpp') diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp index 3c856914053..bc961386e6d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -874,6 +874,7 @@ bool FastISel::selectXRayCustomEvent(const CallInst *I) { TII.get(TargetOpcode::PATCHABLE_EVENT_CALL)); for (auto &MO : Ops) MIB.add(MO); + // Insert the Patchable Event Call instruction, that gets lowered properly. return true; } -- cgit v1.2.3