[PATCH] R600: Fix input modifiers lost for Cayman

[Vincent Lejeune]

http://llvm-reviews.chandlerc.com/D2367

Files:
  lib/Target/R600/R600ExpandSpecialInstrs.cpp
  test/CodeGen/R600/llvm.exp2.ll

Index: lib/Target/R600/R600ExpandSpecialInstrs.cpp
===================================================================
--- lib/Target/R600/R600ExpandSpecialInstrs.cpp
+++ lib/Target/R600/R600ExpandSpecialInstrs.cpp
@@ -33,6 +33,9 @@
   static char ID;
   const R600InstrInfo *TII;
 
+  void SetFlagInNewMI(MachineInstr *NewMI, const MachineInstr *OldMI,
+      unsigned Op);
+
 public:
   R600ExpandSpecialInstrsPass(TargetMachine &tm) : MachineFunctionPass(ID),
     TII(0) { }
@@ -52,6 +55,15 @@
   return new R600ExpandSpecialInstrsPass(TM);
 }
 
+void R600ExpandSpecialInstrsPass::SetFlagInNewMI(MachineInstr *NewMI,
+    const MachineInstr *OldMI, unsigned Op) {
+  int OpIdx = TII->getOperandIdx(*OldMI, Op);
+  if (OpIdx > -1) {
+    uint64_t Val = OldMI->getOperand(OpIdx).getImm();
+    TII->setImmOperand(NewMI, Op, Val);
+  }
+}
+
 bool R600ExpandSpecialInstrsPass::runOnMachineFunction(MachineFunction &MF) {
   TII = static_cast<const R600InstrInfo *>(MF.getTarget().getInstrInfo());
 
@@ -322,6 +334,12 @@
         if (NotLast) {
           TII->addFlag(NewMI, 0, MO_FLAG_NOT_LAST);
         }
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::clamp);
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::literal);
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::src0_abs);
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::src1_abs);
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::src0_neg);
+        SetFlagInNewMI(NewMI, &MI, AMDGPU::OpName::src1_neg);
       }
       MI.eraseFromParent();
     }
Index: test/CodeGen/R600/llvm.exp2.ll
===================================================================
--- /dev/null
+++ test/CodeGen/R600/llvm.exp2.ll
@@ -0,0 +1,26 @@
+;RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s --check-prefix=EG-CHECK
+;RUN: llc < %s -march=r600 -mcpu=cayman | FileCheck %s --check-prefix=CM-CHECK
+
+;EG-CHECK-LABEL: @test
+;EG-CHECK: EXP_IEEE *
+;CM-CHECK-LABEL: @test
+;CM-CHECK: EXP_IEEE T{{[0-9]+}}.X, -|T{{[0-9]+}}.X|
+;CM-CHECK: EXP_IEEE T{{[0-9]+}}.Y (MASKED), -|T{{[0-9]+}}.X|
+;CM-CHECK: EXP_IEEE T{{[0-9]+}}.Z (MASKED), -|T{{[0-9]+}}.X|
+;CM-CHECK: EXP_IEEE * T{{[0-9]+}}.W (MASKED), -|T{{[0-9]+}}.X|
+
+define void @test(<4 x float> inreg %reg0) #0 {
+   %r0 = extractelement <4 x float> %reg0, i32 0
+   %r1 = call float @llvm.fabs.f32(float %r0)
+   %r2 = fsub float -0.000000e+00, %r1
+   %r3 = call float @llvm.exp2.f32(float %r2)
+   %vec = insertelement <4 x float> undef, float %r3, i32 0
+   call void @llvm.R600.store.swizzle(<4 x float> %vec, i32 0, i32 0)
+   ret void
+}
+
+declare float @llvm.exp2.f32(float) readnone
+declare float @llvm.fabs.f32(float) readnone
+declare void @llvm.R600.store.swizzle(<4 x float>, i32, i32)
+
+attributes #0 = { "ShaderType"="0" }
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