From 7761008c2a3ca3ec798a3c4328fdbd4aef24c990 Mon Sep 17 00:00:00 2001
From: Colin LeMahieu <colinl@codeaurora.org>
Date: Tue, 10 Mar 2015 20:04:44 +0000
Subject: [PATCH] [Hexagon] Adding nodes for PIC support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231829 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Hexagon/HexagonISelLowering.h |  4 ++
 lib/Target/Hexagon/HexagonInstrInfoV4.td | 60 ++++++++++++++++++++----
 2 files changed, 55 insertions(+), 9 deletions(-)

diff --git a/lib/Target/Hexagon/HexagonISelLowering.h b/lib/Target/Hexagon/HexagonISelLowering.h
index 74afabbd387..620c73695ac 100644
--- a/lib/Target/Hexagon/HexagonISelLowering.h
+++ b/lib/Target/Hexagon/HexagonISelLowering.h
@@ -37,6 +37,10 @@ bool isPositiveHalfWord(SDNode *N);
       ADJDYNALLOC,
       ARGEXTEND,
 
+      PIC_ADD,
+      AT_GOT,
+      AT_PCREL,
+
       CMPICC,      // Compare two GPR operands, set icc.
       CMPFCC,      // Compare two FP operands, set fcc.
       BRICC,       // Branch to dest on icc condition
diff --git a/lib/Target/Hexagon/HexagonInstrInfoV4.td b/lib/Target/Hexagon/HexagonInstrInfoV4.td
index aa50084d352..2bb7a887431 100644
--- a/lib/Target/Hexagon/HexagonInstrInfoV4.td
+++ b/lib/Target/Hexagon/HexagonInstrInfoV4.td
@@ -314,16 +314,15 @@ let opExtendable = 1 in
 def A4_combineir : T_Combine1<0b01, (ins s8Ext:$s8, IntRegs:$Rs),
                                     "$Rdd = combine(#$s8, $Rs)">;
 
-def HexagonWrapperCombineRI_V4 :
-  SDNode<"HexagonISD::WrapperCombineRI_V4", SDTHexagonI64I32I32>;
-def HexagonWrapperCombineIR_V4 :
-  SDNode<"HexagonISD::WrapperCombineIR_V4", SDTHexagonI64I32I32>;
+// The complexity of the combines involving immediates should be greater
+// than the complexity of the combine with two registers.
+let AddedComplexity = 50 in {
+def: Pat<(HexagonCOMBINE IntRegs:$r, s8ExtPred:$i),
+         (A4_combineri IntRegs:$r, s8ExtPred:$i)>;
 
-def : Pat <(HexagonWrapperCombineRI_V4 IntRegs:$r, s8ExtPred:$i),
-           (A4_combineri IntRegs:$r, s8ExtPred:$i)>;
-
-def : Pat <(HexagonWrapperCombineIR_V4 s8ExtPred:$i, IntRegs:$r),
-           (A4_combineir s8ExtPred:$i, IntRegs:$r)>;
+def: Pat<(HexagonCOMBINE s8ExtPred:$i, IntRegs:$r),
+         (A4_combineir s8ExtPred:$i, IntRegs:$r)>;
+}
 
 // A4_combineii: Set two small immediates.
 let hasSideEffects = 0, isExtendable = 1, opExtentBits = 6, opExtendable = 2 in
@@ -1819,6 +1818,49 @@ def: LogLogNot_pat<and, or,  C4_and_orn>;
 def: LogLogNot_pat<or,  and, C4_or_andn>;
 def: LogLogNot_pat<or,  or,  C4_or_orn>;
 
+//===----------------------------------------------------------------------===//
+// PIC: Support for PIC compilations. The patterns and SD nodes defined
+// below are needed to support code generation for PIC
+//===----------------------------------------------------------------------===//
+
+def SDT_HexagonPICAdd
+  : SDTypeProfile<1, 1, [SDTCisVT<0, i32>, SDTCisVT<1, i32>]>;
+def SDT_HexagonGOTAdd
+  : SDTypeProfile<1, 2, [SDTCisVT<0, i32>, SDTCisVT<1, i32>]>;
+
+def SDT_HexagonGOTAddInternal   : SDTypeProfile<1, 1, [SDTCisVT<0, i32>]>;
+def SDT_HexagonGOTAddInternalJT : SDTypeProfile<1, 1, [SDTCisVT<0, i32>]>;
+def SDT_HexagonGOTAddInternalBA : SDTypeProfile<1, 1, [SDTCisVT<0, i32>]>;
+
+def Hexagonpic_add      : SDNode<"HexagonISD::PIC_ADD", SDT_HexagonPICAdd>;
+def Hexagonat_got       : SDNode<"HexagonISD::AT_GOT", SDT_HexagonGOTAdd>;
+def Hexagongat_pcrel    : SDNode<"HexagonISD::AT_PCREL",
+                                 SDT_HexagonGOTAddInternal>;
+def Hexagongat_pcrel_jt : SDNode<"HexagonISD::AT_PCREL",
+                                 SDT_HexagonGOTAddInternalJT>;
+def Hexagongat_pcrel_ba : SDNode<"HexagonISD::AT_PCREL",
+                                 SDT_HexagonGOTAddInternalBA>;
+
+// PIC: Map from a block address computation to a PC-relative add
+def: Pat<(Hexagongat_pcrel_ba tblockaddress:$src1),
+         (C4_addipc u6ExtPred:$src1)>;
+
+// PIC: Map from the computation to generate a GOT pointer to a PC-relative add
+def: Pat<(Hexagonpic_add texternalsym:$src1),
+         (C4_addipc u6ExtPred:$src1)>;
+
+// PIC: Map from a jump table address computation to a PC-relative add
+def: Pat<(Hexagongat_pcrel_jt tjumptable:$src1),
+         (C4_addipc u6ExtPred:$src1)>;
+
+// PIC: Map from a GOT-relative symbol reference to a load
+def: Pat<(Hexagonat_got (i32 IntRegs:$src1), tglobaladdr:$src2),
+         (L2_loadri_io IntRegs:$src1, s11_2ExtPred:$src2)>;
+
+// PIC: Map from a static symbol reference to a PC-relative add
+def: Pat<(Hexagongat_pcrel tglobaladdr:$src1),
+         (C4_addipc u6ExtPred:$src1)>;
+
 //===----------------------------------------------------------------------===//
 // CR -
 //===----------------------------------------------------------------------===//
-- 
2.34.1