[llvm] r297958 - [AMDGPU] Run always inliner early in opt

[Stanislav Mekhanoshin via llvm-commits]

Author: rampitec
Date: Thu Mar 16 11:11:46 2017
New Revision: 297958

URL: http://llvm.org/viewvc/llvm-project?rev=297958&view=rev
Log:
[AMDGPU] Run always inliner early in opt

We can mark functions to always inline early in the opt. Since we do not have
call support this early inlining creates opportunities for inter-procedural
optimizations which would not occur otherwise.

Differential Revision: https://reviews.llvm.org/D31016

Added:
    llvm/trunk/test/CodeGen/AMDGPU/early-inline.ll
Modified:
    llvm/trunk/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp?rev=297958&r1=297957&r2=297958&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp Thu Mar 16 11:11:46 2017
@@ -244,6 +244,7 @@ void AMDGPUTargetMachine::adjustPassMana
         }));
         PM.add(createGlobalDCEPass());
       }
+      PM.add(createAMDGPUAlwaysInlinePass());
   });
 }
 

Added: llvm/trunk/test/CodeGen/AMDGPU/early-inline.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/early-inline.ll?rev=297958&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/early-inline.ll (added)
+++ llvm/trunk/test/CodeGen/AMDGPU/early-inline.ll Thu Mar 16 11:11:46 2017
@@ -0,0 +1,21 @@
+; RUN: opt -mtriple=amdgcn-- -O1 -S -inline-threshold=1 %s | FileCheck %s
+
+define i32 @callee(i32 %x) {
+entry:
+  %mul1 = mul i32 %x, %x
+  %mul2 = mul i32 %mul1, %x
+  %mul3 = mul i32 %mul1, %mul2
+  %mul4 = mul i32 %mul3, %mul2
+  %mul5 = mul i32 %mul4, %mul3
+  ret i32 %mul5
+}
+
+; CHECK-LABEL: @caller
+; CHECK: mul i32
+; CHECK-NOT: call i32
+
+define i32 @caller(i32 %x) {
+entry:
+  %res = call i32 @callee(i32 %x)
+  ret i32 %res
+}