R600: Use shared op optimization when checking cycle compatibility

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189981 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/R600/R600InstrInfo.cpp b/lib/Target/R600/R600InstrInfo.cpp
index e3cb71b05c336fa7d24327b03ac6b77cbdd3613f..0e7cfb4354ff102acee8ab29a54a277577a66cc1 100644 (file)
--- a/lib/Target/R600/R600InstrInfo.cpp
+++ b/lib/Target/R600/R600InstrInfo.cpp
@@ -336,6 +336,8 @@ R600InstrInfo::ExtractSrcs(MachineInstr *MI,
 static std::vector<std::pair<int, unsigned> >
 Swizzle(std::vector<std::pair<int, unsigned> > Src,
         R600InstrInfo::BankSwizzle Swz) {
+  if (Src[0] == Src[1])
+    Src[1].first = -1;
   switch (Swz) {
   case R600InstrInfo::ALU_VEC_012_SCL_210:
     break;

diff --git a/test/CodeGen/R600/shared-op-cycle.ll b/test/CodeGen/R600/shared-op-cycle.ll
new file mode 100644 (file)
index 0000000..c49b5f4
--- /dev/null
+++ b/test/CodeGen/R600/shared-op-cycle.ll
@@ -0,0 +1,38 @@
+; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
+
+; CHECK: @main
+; CHECK: MULADD_IEEE *
+; CHECK-NOT: MULADD_IEEE *
+
+define void @main() {
+   %w0 = call float @llvm.R600.load.input(i32 3)
+   %w1 = call float @llvm.R600.load.input(i32 7)
+   %w2 = call float @llvm.R600.load.input(i32 11)
+   %sq0 = fmul float %w0, %w0
+   %r0 = fadd float %sq0, 2.0
+   %sq1 = fmul float %w1, %w1
+   %r1 = fadd float %sq1, 2.0
+   %sq2 = fmul float %w2, %w2
+   %r2 = fadd float %sq2, 2.0
+   %v0 = insertelement <4 x float> undef, float %r0, i32 0
+   %v1 = insertelement <4 x float> %v0, float %r1, i32 1
+   %v2 = insertelement <4 x float> %v1, float %r2, i32 2
+   %res = call float @llvm.AMDGPU.dp4(<4 x float> %v2, <4 x float> %v2)
+   %vecres = insertelement <4 x float> undef, float %res, i32 0
+   call void @llvm.R600.store.swizzle(<4 x float> %vecres, i32 0, i32 2)
+   ret void
+}
+
+; Function Attrs: readnone
+declare float @llvm.R600.load.input(i32) #1
+
+; Function Attrs: readnone
+declare float @llvm.AMDGPU.dp4(<4 x float>, <4 x float>) #1
+
+
+declare void @llvm.R600.store.swizzle(<4 x float>, i32, i32)
+
+attributes #0 = { "ShaderType"="1" }
+attributes #1 = { readnone }
+attributes #2 = { readonly }
+attributes #3 = { nounwind readonly }
\ No newline at end of file