Hexagon: Expand addc, adde, subc and sube.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176505 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 86 insertions, 0 deletions

diff --git a/lib/Target/Hexagon/HexagonISelLowering.cpp b/lib/Target/Hexagon/HexagonISelLowering.cpp
index fac931a4bd..e5c5400d08 100644
--- a/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1365,6 +1365,29 @@ HexagonTargetLowering::HexagonTargetLowering(HexagonTargetMachine
     setOperationAction(ISD::FREM , MVT::f32, Expand);
     setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
     setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
+
+    // In V4, we have double word add/sub with carry. The problem with
+    // modelling this instruction is that it produces 2 results - Rdd and Px.
+    // To model update of Px, we will have to use Defs[p0..p3] which will
+    // cause any predicate live range to spill. So, we pretend we dont't
+    // have these instructions.
+    setOperationAction(ISD::ADDE, MVT::i8, Expand);
+    setOperationAction(ISD::ADDE, MVT::i16, Expand);
+    setOperationAction(ISD::ADDE, MVT::i32, Expand);
+    setOperationAction(ISD::ADDE, MVT::i64, Expand);
+    setOperationAction(ISD::SUBE, MVT::i8, Expand);
+    setOperationAction(ISD::SUBE, MVT::i16, Expand);
+    setOperationAction(ISD::SUBE, MVT::i32, Expand);
+    setOperationAction(ISD::SUBE, MVT::i64, Expand);
+    setOperationAction(ISD::ADDC, MVT::i8, Expand);
+    setOperationAction(ISD::ADDC, MVT::i16, Expand);
+    setOperationAction(ISD::ADDC, MVT::i32, Expand);
+    setOperationAction(ISD::ADDC, MVT::i64, Expand);
+    setOperationAction(ISD::SUBC, MVT::i8, Expand);
+    setOperationAction(ISD::SUBC, MVT::i16, Expand);
+    setOperationAction(ISD::SUBC, MVT::i32, Expand);
+    setOperationAction(ISD::SUBC, MVT::i64, Expand);
+
     setOperationAction(ISD::CTPOP, MVT::i32, Expand);
     setOperationAction(ISD::CTPOP, MVT::i64, Expand);
     setOperationAction(ISD::CTTZ , MVT::i32, Expand);
diff --git a/test/CodeGen/Hexagon/adde.ll b/test/CodeGen/Hexagon/adde.ll
new file mode 100644
index 0000000000..9cee3e215d
--- /dev/null
+++ b/test/CodeGen/Hexagon/adde.ll
@@ -0,0 +1,34 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+; CHECK: r{{[0-9]+:[0-9]+}} = #0
+; CHECK: r{{[0-9]+:[0-9]+}} = #1
+; CHECK: r{{[0-9]+:[0-9]+}} = add(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: p{{[0-9]+}} = cmp.gtu(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: p{{[0-9]+}} = cmp.gtu(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = combine(r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = combine(r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = add(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+
+
+define void @check_adde_addc (i64 %AL, i64 %AH, i64 %BL, i64 %BH, i64* %RL, i64* %RH) {
+entry:
+        %tmp1 = zext i64 %AL to i128
+        %tmp23 = zext i64 %AH to i128
+        %tmp4 = shl i128 %tmp23, 64
+        %tmp5 = or i128 %tmp4, %tmp1
+        %tmp67 = zext i64 %BL to i128
+        %tmp89 = zext i64 %BH to i128
+        %tmp11 = shl i128 %tmp89, 64
+        %tmp12 = or i128 %tmp11, %tmp67
+        %tmp15 = add i128 %tmp12, %tmp5
+        %tmp1617 = trunc i128 %tmp15 to i64
+        store i64 %tmp1617, i64* %RL
+        %tmp21 = lshr i128 %tmp15, 64
+        %tmp2122 = trunc i128 %tmp21 to i64
+        store i64 %tmp2122, i64* %RH
+        ret void
+}
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diff --git a/test/CodeGen/Hexagon/sube.ll b/test/CodeGen/Hexagon/sube.ll
new file mode 100644
index 0000000000..84172e957d
--- /dev/null
+++ b/test/CodeGen/Hexagon/sube.ll
@@ -0,0 +1,29 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+; CHECK: r{{[0-9]+:[0-9]+}} = #0
+; CHECK: r{{[0-9]+:[0-9]+}} = #1
+; CHECK: p{{[0-9]+}} = cmp.gtu(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+}} = mux(p{{[0-9]+}}, r{{[0-9]+}}, r{{[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = sub(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = sub(r{{[0-9]+:[0-9]+}}, r{{[0-9]+:[0-9]+}})
+; CHECK: r{{[0-9]+:[0-9]+}} = combine(r{{[0-9]+}}, r{{[0-9]+}})
+
+define void @check_sube_subc(i64 %AL, i64 %AH, i64 %BL, i64 %BH, i64* %RL, i64* %RH) {
+entry:
+        %tmp1 = zext i64 %AL to i128
+        %tmp23 = zext i64 %AH to i128
+        %tmp4 = shl i128 %tmp23, 64
+        %tmp5 = or i128 %tmp4, %tmp1
+        %tmp67 = zext i64 %BL to i128
+        %tmp89 = zext i64 %BH to i128
+        %tmp11 = shl i128 %tmp89, 64
+        %tmp12 = or i128 %tmp11, %tmp67
+        %tmp15 = sub i128 %tmp5, %tmp12
+        %tmp1617 = trunc i128 %tmp15 to i64
+        store i64 %tmp1617, i64* %RL
+        %tmp21 = lshr i128 %tmp15, 64
+        %tmp2122 = trunc i128 %tmp21 to i64
+        store i64 %tmp2122, i64* %RH
+        ret void
+}
\ No newline at end of file