Add Thumb2 pc relative add.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74141 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMInstrThumb.td

@@ -128,7 +128,7 @@ PseudoInst<(outs), (ins i32imm:$amt),
 }
 
 let isNotDuplicable = 1 in
-def tPICADD : TIt<(outs tGPR:$dst), (ins tGPR:$lhs, pclabel:$cp),
+def tPICADD : T1It<(outs tGPR:$dst), (ins tGPR:$lhs, pclabel:$cp),
                   "$cp:\n\tadd $dst, pc",
                   [(set tGPR:$dst, (ARMpic_add tGPR:$lhs, imm:$cp))]>;
 

lib/Target/ARM/ARMInstrThumb2.td

@@ -314,6 +314,33 @@ multiclass T2I_cmp_is<string opc, PatFrag opnode> {
 }
 }
 
+//===----------------------------------------------------------------------===//
+//  Miscellaneous Instructions.
+//
+
+let isNotDuplicable = 1 in
+def t2PICADD : T2I<(outs tGPR:$dst), (ins tGPR:$lhs, pclabel:$cp),
+                   "$cp:\n\tadd $dst, pc",
+                   [(set tGPR:$dst, (ARMpic_add tGPR:$lhs, imm:$cp))]>;
+
+
+// LEApcrel - Load a pc-relative address into a register without offending the
+// assembler.
+def t2LEApcrel : T2I<(outs GPR:$dst), (ins i32imm:$label, pred:$p),
+                   !strconcat(!strconcat(".set PCRELV${:uid}, ($label-(",
+                                         "${:private}PCRELL${:uid}+8))\n"),
+                              !strconcat("${:private}PCRELL${:uid}:\n\t",
+                                         "add$p $dst, pc, #PCRELV${:uid}")),
+                   []>;
+
+def t2LEApcrelJT : T2I<(outs GPR:$dst),
+                       (ins i32imm:$label, i32imm:$id, pred:$p),
+          !strconcat(!strconcat(".set PCRELV${:uid}, (${label}_${id:no_hash}-(",
+                                         "${:private}PCRELL${:uid}+8))\n"),
+                              !strconcat("${:private}PCRELL${:uid}:\n\t",
+                                         "add$p $dst, pc, #PCRELV${:uid}")),
+                   []>;
+
 //===----------------------------------------------------------------------===//
 //  Arithmetic Instructions.
 //
@@ -493,6 +520,12 @@ def : Thumb2Pat<(ARMcmpNZ  GPR:$src, t2_so_imm_neg:$imm),
 // Non-Instruction Patterns
 //
 
+// ConstantPool, GlobalAddress, and JumpTable
+def : Thumb2Pat<(ARMWrapper  tglobaladdr :$dst), (t2LEApcrel tglobaladdr :$dst)>;
+def : Thumb2Pat<(ARMWrapper  tconstpool  :$dst), (t2LEApcrel tconstpool  :$dst)>;
+def : Thumb2Pat<(ARMWrapperJT tjumptable:$dst, imm:$id),
+                (t2LEApcrelJT tjumptable:$dst, imm:$id)>;
+
 // Large immediate handling.
 
 def : Thumb2Pat<(i32 imm:$src),

test/CodeGen/Thumb2/load-global.ll

@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin
+; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin -relocation-model=pic | grep add | grep pc
+
+@G = external global i32
+
+define i32 @test1() {
+	%tmp = load i32* @G
+	ret i32 %tmp
+}

test/CodeGen/Thumb2/pic-jtbl.ll

@@ -0,0 +1,55 @@
+; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin -relocation-model=pic \
+; RUN:   -o %t -f
+; RUN: grep add %t | grep pc
+;; NOT YET: grep "add pc"
+
+define void @bar(i32 %n.u) {
+entry:
+    switch i32 %n.u, label %bb12 [i32 1, label %bb i32 2, label %bb6 i32 4, label %bb7 i32 5, label %bb8 i32 6, label %bb10 i32 7, label %bb1 i32 8, label %bb3 i32 9, label %bb4 i32 10, label %bb9 i32 11, label %bb2 i32 12, label %bb5 i32 13, label %bb11 ]
+bb:
+    tail call void(...)* @foo1()
+    ret void
+bb1:
+    tail call void(...)* @foo2()
+    ret void
+bb2:
+    tail call void(...)* @foo6()
+    ret void
+bb3:
+    tail call void(...)* @foo3()
+    ret void
+bb4:
+    tail call void(...)* @foo4()
+    ret void
+bb5:
+    tail call void(...)* @foo5()
+    ret void
+bb6:
+    tail call void(...)* @foo1()
+    ret void
+bb7:
+    tail call void(...)* @foo2()
+    ret void
+bb8:
+    tail call void(...)* @foo6()
+    ret void
+bb9:
+    tail call void(...)* @foo3()
+    ret void
+bb10:
+    tail call void(...)* @foo4()
+    ret void
+bb11:
+    tail call void(...)* @foo5()
+    ret void
+bb12:
+    tail call void(...)* @foo6()
+    ret void
+}
+
+declare void @foo1(...)
+declare void @foo2(...)
+declare void @foo6(...)
+declare void @foo3(...)
+declare void @foo4(...)
+declare void @foo5(...)