Incremental big endian patch by Jack Carter.

These changes allow us to compile big endian from the command line for 32 bit
Mips targets. This patch will result in code and data actually being produced
in the correct endianess.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153153 91177308-0d34-0410-b5e6-96231b3b80d8

test/MC/Mips/elf-bigendian.ll

@@ -0,0 +1,45 @@
+; RUN: llc -filetype=obj -mtriple mips-unknown-linux %s -o - | elf-dump --dump-section-data  | FileCheck %s
+
+; Check that this is big endian.
+; CHECK: ('e_indent[EI_DATA]', 0x02)
+
+; Make sure that a section table (text) entry is correct.
+; CHECK:   (('sh_name', 0x{{[0]*}}5) # '.text'
+; CHECKNEXT:   ('sh_type', 0x{{[0]*}}1)
+; CHECKNEXT:   ('sh_flags', 0x{{[0]*}}6)
+; CHECKNEXT:   ('sh_addr', 0x{{{[0-9,a-f]+}})
+; CHECKNEXT:   ('sh_offset', 0x{{{[0-9,a-f]+}})
+; CHECKNEXT:   ('sh_size', 0x{{{[0-9,a-f]+}})
+; CHECKNEXT:   ('sh_link', 0x{{[0]+}})
+; CHECKNEXT:   ('sh_info', 0x{{[0]+}})
+; CHECKNEXT:   ('sh_addralign', 0x{{[0]*}}4)
+; CHECKNEXT:   ('sh_entsize', 0x{{[0]+}})
+
+; See that at least first 3 instructions are correct: GP prologue
+; CHECKNEXT:   ('_section_data', '3c1c0000 279c0000 0399e021 {{[0-9,a-f]*}}')
+
+; ModuleID = '../br1.c'
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:32-i16:16:32-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-n32"
+target triple = "mips-unknown-linux"
+
+@x = global i32 1, align 4
+@str = private unnamed_addr constant [4 x i8] c"goo\00"
+@str2 = private unnamed_addr constant [4 x i8] c"foo\00"
+
+define i32 @main() nounwind {
+entry:
+  %0 = load i32* @x, align 4
+  %tobool = icmp eq i32 %0, 0
+  br i1 %tobool, label %if.end, label %foo
+
+if.end:                                           ; preds = %entry
+  %puts = tail call i32 @puts(i8* getelementptr inbounds ([4 x i8]* @str, i32 0, i32 0))
+  br label %foo
+
+foo:                                              ; preds = %entry, %if.end
+  %puts2 = tail call i32 @puts(i8* getelementptr inbounds ([4 x i8]* @str2, i32 0, i32 0))
+  ret i32 0
+}
+
+declare i32 @puts(i8* nocapture) nounwind
+