From 857efb0880dbfbb0f52f401f18f9c3717f6cc276 Mon Sep 17 00:00:00 2001 From: Richard Smith Date: Mon, 7 Nov 2016 16:47:20 +0000 Subject: [PATCH] Add -O0 support for @llvm.invariant.group.barrier by discarding it if it gets to ISel. Differential Revision: https://reviews.llvm.org/D26292 llvm-svn: 286119 --- llvm/lib/CodeGen/SelectionDAG/FastISel.cpp | 1 + llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 1 + llvm/test/CodeGen/Generic/intrinsics.ll | 7 +++++++ 3 files changed, 9 insertions(+) diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp index 4ca2249..452bb05 100644 --- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -1216,6 +1216,7 @@ bool FastISel::selectIntrinsicCall(const IntrinsicInst *II) { updateValueMap(II, ResultReg); return true; } + case Intrinsic::invariant_group_barrier: case Intrinsic::expect: { unsigned ResultReg = getRegForValue(II->getArgOperand(0)); if (!ResultReg) diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index eea5dcc..b588d9b 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -5460,6 +5460,7 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) { } case Intrinsic::annotation: case Intrinsic::ptr_annotation: + case Intrinsic::invariant_group_barrier: // Drop the intrinsic, but forward the value setValue(&I, getValue(I.getOperand(0))); return nullptr; diff --git a/llvm/test/CodeGen/Generic/intrinsics.ll b/llvm/test/CodeGen/Generic/intrinsics.ll index 29bc499..4d04786 100644 --- a/llvm/test/CodeGen/Generic/intrinsics.ll +++ b/llvm/test/CodeGen/Generic/intrinsics.ll @@ -1,4 +1,5 @@ ; RUN: llc < %s +; RUN: llc -O0 < %s ;; SQRT declare float @llvm.sqrt.f32(float) @@ -38,3 +39,9 @@ define double @test_cos(float %F) { ret double %I } +declare i8* @llvm.invariant.group.barrier(i8*) + +define i8* @barrier(i8* %p) { + %q = call i8* @llvm.invariant.group.barrier(i8* %p) + ret i8* %q +} -- 2.7.4