[llvm] r304628 - AMDGPU/GlobalISel: Mark 1-bit integer constants as legal

[Tom Stellard via llvm-commits]

Author: tstellar
Date: Fri Jun  2 20:13:33 2017
New Revision: 304628

URL: http://llvm.org/viewvc/llvm-project?rev=304628&view=rev
Log:
AMDGPU/GlobalISel: Mark 1-bit integer constants as legal

Summary:
These are mostly legal, but will probably need special lowering for some
cases.

Reviewers: arsenm

Reviewed By: arsenm

Subscribers: kzhuravl, wdng, nhaehnle, yaxunl, rovka, kristof.beyls, igorb, dstuttard, tpr, llvm-commits, t-tye

Differential Revision: https://reviews.llvm.org/D33791

Modified:
    llvm/trunk/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/legalize-constant.mir

Modified: llvm/trunk/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp?rev=304628&r1=304627&r2=304628&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp Fri Jun  2 20:13:33 2017
@@ -28,11 +28,16 @@ using namespace llvm;
 AMDGPULegalizerInfo::AMDGPULegalizerInfo() {
   using namespace TargetOpcode;
 
+  const LLT S1= LLT::scalar(1);
   const LLT S32 = LLT::scalar(32);
   const LLT S64 = LLT::scalar(64);
   const LLT P1 = LLT::pointer(1, 64);
   const LLT P2 = LLT::pointer(2, 64);
 
+  // FIXME: i1 operands to intrinsics should always be legal, but other i1
+  // values may not be legal.  We need to figure out how to distinguish
+  // between these two scenarios.
+  setAction({G_CONSTANT, S1}, Legal);
   setAction({G_CONSTANT, S32}, Legal);
   setAction({G_CONSTANT, S64}, Legal);
 

Modified: llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/legalize-constant.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/legalize-constant.mir?rev=304628&r1=304627&r2=304628&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/legalize-constant.mir (original)
+++ llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/legalize-constant.mir Fri Jun  2 20:13:33 2017
@@ -10,18 +10,27 @@
   entry:
     ret void
   }
+
+  declare void @llvm.amdgcn.exp.f32(i32, i32, float, float, float, float, i1, i1) #1
+
+  attributes #1 = { nounwind }
+
 ...
 
 ---
 name:            test_constant
 registers:
   - { id: 0, class: _ }
+  - { id: 1, class: _ }
 body: |
   bb.0.entry:
     ; CHECK-LABEL: name: test_constant
     ; CHECK: %0(s32) = G_CONSTANT i32 5
+    ; CHECK: %1(s1) = G_CONSTANT i1 false
 
     %0(s32) = G_CONSTANT i32 5
+    %1(s1) = G_CONSTANT i1 0
+    G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.amdgcn.exp.f32), %0, %0, %0, %0, %0, %0, %1, %1;
 ...
 
 ---