R600/SI: Add SIFoldOperands pass

This pass attempts to fold the source operands of mov and copy
instructions into their uses.

llvm-svn: 222581

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/R600/operand-folding.ll b/llvm/test/CodeGen/R600/operand-folding.ll
new file mode 100644
index 00000000000..05177b475b1
--- /dev/null
+++ b/llvm/test/CodeGen/R600/operand-folding.ll
@@ -0,0 +1,40 @@
+; RUN: llc < %s -march=r600 -mcpu=SI -verify-machineinstrs | FileCheck %s
+
+; CHECK-LABEL: {{^}}fold_sgpr:
+; CHECK: v_add_i32_e32 v{{[0-9]+}}, s
+define void @fold_sgpr(i32 addrspace(1)* %out, i32 %fold) {
+entry:
+  %tmp0 = icmp ne i32 %fold, 0
+  br i1 %tmp0, label %if, label %endif
+
+if:
+  %id = call i32 @llvm.r600.read.tidig.x()
+  %offset = add i32 %fold, %id
+  %tmp1 = getelementptr i32 addrspace(1)* %out, i32 %offset
+  store i32 0, i32 addrspace(1)* %tmp1
+  br label %endif
+
+endif:
+  ret void
+}
+
+; CHECK-LABEL: {{^}}fold_imm:
+; CHECK v_or_i32_e32 v{{[0-9]+}}, 5
+define void @fold_imm(i32 addrspace(1)* %out, i32 %cmp) {
+entry:
+  %fold = add i32 3, 2
+  %tmp0 = icmp ne i32 %cmp, 0
+  br i1 %tmp0, label %if, label %endif
+
+if:
+  %id = call i32 @llvm.r600.read.tidig.x()
+  %val = or i32 %id, %fold
+  store i32 %val, i32 addrspace(1)* %out
+  br label %endif
+
+endif:
+  ret void
+}
+
+declare i32 @llvm.r600.read.tidig.x() #0
+attributes #0 = { readnone }