From 15e6ef886deedafaf3fcbca8226891ba54dbff9d Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Mon, 23 Nov 2009 20:35:53 +0000
Subject: [PATCH] fold immediate of a + Const into the user as a subtract if it
 can fit as a negated two-part immediate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89694 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrInfo.td   | 22 +++++++++++++++++++---
 lib/Target/ARM/ARMInstrThumb2.td | 21 ++++++++++++++++++---
 2 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 7d26b9dd62d..b0f4dedae03 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -284,6 +284,22 @@ def so_imm2part_2 : SDNodeXForm<imm, [{
   return CurDAG->getTargetConstant(V, MVT::i32);
 }]>;
 
+def so_neg_imm2part : Operand<i32>, PatLeaf<(imm), [{
+      return ARM_AM::isSOImmTwoPartVal(-(int)N->getZExtValue());
+    }]> {
+  let PrintMethod = "printSOImm2PartOperand";
+}
+
+def so_neg_imm2part_1 : SDNodeXForm<imm, [{
+  unsigned V = ARM_AM::getSOImmTwoPartFirst(-(int)N->getZExtValue());
+  return CurDAG->getTargetConstant(V, MVT::i32);
+}]>;
+
+def so_neg_imm2part_2 : SDNodeXForm<imm, [{
+  unsigned V = ARM_AM::getSOImmTwoPartSecond(-(int)N->getZExtValue());
+  return CurDAG->getTargetConstant(V, MVT::i32);
+}]>;
+
 /// imm0_31 predicate - True if the 32-bit immediate is in the range [0,31].
 def imm0_31 : Operand<i32>, PatLeaf<(imm), [{
   return (int32_t)N->getZExtValue() < 32;
@@ -1618,9 +1634,9 @@ def : ARMPat<(xor GPR:$LHS, so_imm2part:$RHS),
 def : ARMPat<(add GPR:$LHS, so_imm2part:$RHS),
              (ADDri (ADDri GPR:$LHS, (so_imm2part_1 imm:$RHS)),
                     (so_imm2part_2 imm:$RHS))>;
-def : ARMPat<(sub GPR:$LHS, so_imm2part:$RHS),
-             (SUBri (SUBri GPR:$LHS, (so_imm2part_1 imm:$RHS)),
-                    (so_imm2part_2 imm:$RHS))>;
+def : ARMPat<(add GPR:$LHS, so_neg_imm2part:$RHS),
+             (SUBri (SUBri GPR:$LHS, (so_neg_imm2part_1 imm:$RHS)),
+                    (so_neg_imm2part_2 imm:$RHS))>;
 
 // 32-bit immediate using movw + movt.
 // This is a single pseudo instruction, the benefit is that it can be remat'd
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 43ecebe7738..c663cd37f13 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -88,6 +88,21 @@ def t2_so_imm2part_2 : SDNodeXForm<imm, [{
   return CurDAG->getTargetConstant(V, MVT::i32);
 }]>;
 
+def t2_so_neg_imm2part : Operand<i32>, PatLeaf<(imm), [{
+      return ARM_AM::isT2SOImmTwoPartVal(-(int)N->getZExtValue());
+    }]> {
+}
+
+def t2_so_neg_imm2part_1 : SDNodeXForm<imm, [{
+  unsigned V = ARM_AM::getT2SOImmTwoPartFirst(-(int)N->getZExtValue());
+  return CurDAG->getTargetConstant(V, MVT::i32);
+}]>;
+
+def t2_so_neg_imm2part_2 : SDNodeXForm<imm, [{
+  unsigned V = ARM_AM::getT2SOImmTwoPartSecond(-(int)N->getZExtValue());
+  return CurDAG->getTargetConstant(V, MVT::i32);
+}]>;
+
 /// imm1_31 predicate - True if the 32-bit immediate is in the range [1,31].
 def imm1_31 : PatLeaf<(i32 imm), [{
   return (int32_t)N->getZExtValue() >= 1 && (int32_t)N->getZExtValue() < 32;
@@ -1162,9 +1177,9 @@ def : T2Pat<(xor GPR:$LHS, t2_so_imm2part:$RHS),
 def : T2Pat<(add GPR:$LHS, t2_so_imm2part:$RHS),
              (t2ADDri (t2ADDri GPR:$LHS, (t2_so_imm2part_1 imm:$RHS)),
                     (t2_so_imm2part_2 imm:$RHS))>;
-def : T2Pat<(sub GPR:$LHS, t2_so_imm2part:$RHS),
-             (t2SUBri (t2SUBri GPR:$LHS, (t2_so_imm2part_1 imm:$RHS)),
-                    (t2_so_imm2part_2 imm:$RHS))>;
+def : T2Pat<(add GPR:$LHS, t2_so_neg_imm2part:$RHS),
+             (t2SUBri (t2SUBri GPR:$LHS, (t2_so_neg_imm2part_1 imm:$RHS)),
+                    (t2_so_neg_imm2part_2 imm:$RHS))>;
 
 // ConstantPool, GlobalAddress, and JumpTable
 def : T2Pat<(ARMWrapper  tglobaladdr :$dst), (t2LEApcrel tglobaladdr :$dst)>;
-- 
2.34.1