Rebased PNaCl localmods in LLVM to 223109

test/NaCl/X86/nacl-read-tp-intrinsic.ll

+; RUN: pnacl-llc -mtriple=i386-unknown-nacl -filetype=asm %s -o - \
+; RUN:   | FileCheck -check-prefix=X32 %s
+
+; RUN: pnacl-llc -mtriple=i386-unknown-nacl -filetype=asm -mtls-use-call %s -o - \
+; RUN:   | FileCheck -check-prefix=USE_CALL %s
+
+; RUN: pnacl-llc -mtriple=x86_64-unknown-nacl -filetype=asm %s -o - \
+; RUN:   | FileCheck -check-prefix=USE_CALL %s
+
+; "-mtls-use-call" should not make any difference on x86-64.
+; RUN: pnacl-llc -mtriple=x86_64-unknown-nacl -filetype=asm -mtls-use-call %s -o - \
+; RUN:   | FileCheck -check-prefix=USE_CALL %s
+
+
+declare i8* @llvm.nacl.read.tp()
+
+define i8* @get_thread_pointer() {
+  %tp = call i8* @llvm.nacl.read.tp()
+  ret i8* %tp
+}
+
+; X32: get_thread_pointer:
+; X32: movl %gs:0, %eax
+
+; USE_CALL: get_thread_pointer:
+; USE_CALL: call{{[lq]?}} __nacl_read_tp
+
+
+; Make sure that we do not generate:
+;   movl $1000, %eax
+;   addl %gs:0, %eax
+; The x86-32 NaCl validator only accepts %gs with "mov", not with
+; "add".  Note that we had to use a large immediate to trigger the bug
+; and generate the code above.
+define i8* @get_thread_pointer_add() {
+  %tp = call i8* @llvm.nacl.read.tp()
+  %result = getelementptr i8* %tp, i32 1000
+  ret i8* %result
+}
+
+; X32: get_thread_pointer_add:
+; X32: movl %gs:0, %eax
+; X32: addl $1000, %eax