[PATCH] R600: Fix trunc i64 to i32 on SI

[Matt Arsenault]

  Attach right patch

http://llvm-reviews.chandlerc.com/D1882

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1882?vs=4791&id=4792#toc

Files:
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/trunc.ll

Index: lib/Target/R600/SIInstructions.td
===================================================================
--- lib/Target/R600/SIInstructions.td
+++ lib/Target/R600/SIInstructions.td
@@ -851,6 +851,11 @@
   (V_CNDMASK_B32_e64 $src0, $src1, $src2)
 >;
 
+def : Pat <
+  (i32 (trunc i64:$val)),
+  (EXTRACT_SUBREG $val, sub0)
+>;
+
 //use two V_CNDMASK_B32_e64 instructions for f64
 def : Pat <
   (f64 (select i1:$src2, f64:$src1, f64:$src0)),
Index: test/CodeGen/R600/trunc.ll
===================================================================
--- test/CodeGen/R600/trunc.ll
+++ test/CodeGen/R600/trunc.ll
@@ -17,3 +17,15 @@
   ret void
 }
 
+; SI-LABEL: @trunc_shl_i64:
+; SI: S_LOAD_DWORDX2
+; SI: S_LOAD_DWORDX2 [[SREG:SGPR[0-9]+_SGPR[0-9]+]]
+; SI: V_LSHL_B64 [[LO_VREG:VGPR[0-9]+]]_VGPR{{[0-9]+}}, [[SREG]], 2
+; SI-NOT: [[LO_VREG]]
+; SI: BUFFER_STORE_DWORD [[LO_VREG]],
+define void @trunc_shl_i64(i32 addrspace(1)* %out, i64 %a) {
+  %b = shl i64 %a, 2
+  %result = trunc i64 %b to i32
+  store i32 %result, i32 addrspace(1)* %out, align 4
+  ret void
+}
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