Merging MIPS GOT changeset into 3.2 release branch.

Merging r168471:

Mips direct object xgot support

This patch provides support for the MIPS relocations:

    *)  R_MIPS_GOT_HI16
    *)  R_MIPS_GOT_LO16
    *)  R_MIPS_CALL_HI16
    *)  R_MIPS_CALL_LO16

These are used for large GOT instruction sequences.

Contributer: Jack Carter

Merging r168460:

[mips] Generate big GOT code.

Merging r168458:

[mips] Simplify lowering functions in MipsISelLowering.cpp by using the helper
functions added in r168456.

Merging r168456:

[mips] Add helper functions that create nodes for computing address.

Merging r168455:

[mips] Add command line option "-mxgot".

Merging r168453:

[mips] When a node which loads from a GOT is created, pass a MachinePointerInfo
referring to a GOT entry.

Merging r168450:

[mips] Add target operand flag enums for big GOT relocations.

Merging r168448:

Add relocations used for mips big GOT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_32@169294 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 92 insertions, 0 deletions

diff --git a/test/CodeGen/Mips/biggot.ll b/test/CodeGen/Mips/biggot.ll
new file mode 100644
index 0000000000..c4ad851c82
--- /dev/null
+++ b/test/CodeGen/Mips/biggot.ll
@@ -0,0 +1,50 @@
+; RUN: llc -march=mipsel -mxgot < %s | FileCheck %s -check-prefix=O32
+; RUN: llc -march=mips64el -mcpu=mips64r2 -mattr=+n64 -mxgot < %s | \
+; RUN: FileCheck %s -check-prefix=N64
+
+@v0 = external global i32
+
+define void @foo1() nounwind {
+entry:
+; O32: lui $[[R0:[0-9]+]], %got_hi(v0)
+; O32: addu  $[[R1:[0-9]+]], $[[R0]], ${{[a-z0-9]+}}
+; O32: lw  ${{[0-9]+}}, %got_lo(v0)($[[R1]])
+; O32: lui $[[R2:[0-9]+]], %call_hi(foo0)
+; O32: addu  $[[R3:[0-9]+]], $[[R2]], ${{[a-z0-9]+}}
+; O32: lw  ${{[0-9]+}}, %call_lo(foo0)($[[R3]])
+
+; N64: lui $[[R0:[0-9]+]], %got_hi(v0)
+; N64: daddu  $[[R1:[0-9]+]], $[[R0]], ${{[a-z0-9]+}}
+; N64: ld  ${{[0-9]+}}, %got_lo(v0)($[[R1]])
+; N64: lui $[[R2:[0-9]+]], %call_hi(foo0)
+; N64: daddu  $[[R3:[0-9]+]], $[[R2]], ${{[a-z0-9]+}}
+; N64: ld  ${{[0-9]+}}, %call_lo(foo0)($[[R3]])
+
+  %0 = load i32* @v0, align 4
+  tail call void @foo0(i32 %0) nounwind
+  ret void
+}
+
+declare void @foo0(i32)
+
+; call to external function.
+
+define void @foo2(i32* nocapture %d, i32* nocapture %s, i32 %n) nounwind {
+entry:
+; O32: foo2:
+; O32: lui $[[R2:[0-9]+]], %call_hi(memcpy)
+; O32: addu  $[[R3:[0-9]+]], $[[R2]], ${{[a-z0-9]+}}
+; O32: lw  ${{[0-9]+}}, %call_lo(memcpy)($[[R3]])
+
+; N64: foo2:
+; N64: lui $[[R2:[0-9]+]], %call_hi(memcpy)
+; N64: daddu  $[[R3:[0-9]+]], $[[R2]], ${{[a-z0-9]+}}
+; N64: ld  ${{[0-9]+}}, %call_lo(memcpy)($[[R3]])
+
+  %0 = bitcast i32* %d to i8*
+  %1 = bitcast i32* %s to i8*
+  tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* %1, i32 %n, i32 4, i1 false)
+  ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
diff --git a/test/MC/Mips/xgot.ll b/test/MC/Mips/xgot.ll
new file mode 100644
index 0000000000..bfe9b9ad66
--- /dev/null
+++ b/test/MC/Mips/xgot.ll
@@ -0,0 +1,42 @@
+; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mxgot %s -o - | elf-dump --dump-section-data  | FileCheck %s
+
+@.str = private unnamed_addr constant [16 x i8] c"ext_1=%d, i=%d\0A\00", align 1
+@ext_1 = external global i32
+
+define void @fill() nounwind {
+entry:
+
+; Check that the appropriate relocations were created. 
+; For the xgot case we want to see R_MIPS_[GOT|CALL]_[HI|LO]16.
+
+; R_MIPS_HI16
+; CHECK:     ('r_type', 0x05)
+
+; R_MIPS_LO16
+; CHECK:     ('r_type', 0x06)
+
+; R_MIPS_GOT_HI16
+; CHECK:     ('r_type', 0x16)
+
+; R_MIPS_GOT_LO16
+; CHECK:     ('r_type', 0x17)
+
+; R_MIPS_GOT
+; CHECK:     ('r_type', 0x09)
+
+; R_MIPS_LO16
+; CHECK:     ('r_type', 0x06)
+
+; R_MIPS_CALL_HI16
+; CHECK:     ('r_type', 0x1e)
+
+; R_MIPS_CALL_LO16
+; CHECK:     ('r_type', 0x1f)
+
+  %0 = load i32* @ext_1, align 4
+  %call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([16 x i8]* @.str, i32 0, i32 0), i32 %0) nounwind
+  ret void
+}
+
+declare i32 @printf(i8* nocapture, ...) nounwind
+