Rebased PNaCl localmods in LLVM to 223109

test/NaCl/X86/dynamic-stack-alloc.ll

+; RUN: llc -mtriple=x86_64-nacl %s -o - | FileCheck %s
+; RUN: llc -mtriple=x86_64-nacl -fast-isel %s -o - | FileCheck %s
+
+; Test calling with many parameters (such that some need to go on the stack),
+; along with dynamic stack allocation and x86-64 NaCl stack/frame
+; register sandboxing.
+
+declare i32 @callee(i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5, i32 %a6, i32 %a7, i32 %a8, i8* %ptr)
+
+define i32 @dyn_stack_alloc (i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5, i32 %a6, i32 %a7, i32 %a8, i32 %amt) {
+  %p = alloca i8, i32 %amt, align 1
+  %x = call i32 @callee(i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5, i32 %a6, i32 %a7, i32 %a8, i8* %p)
+  ret i32 %x
+}
+
+; CHECK-LABEL: dyn_stack_alloc
+; Set up frame pointer and save two registers.
+; CHECK: movl %ebp, %eax
+; CHECK-NEXT: pushq %rax
+; CHECK: movq %rsp, %rbp
+; CHECK-NEXT: .L
+; CHECK-NEXT: .cfi_def_cfa_register %rbp
+; CHECK-NEXT: pushq
+; CHECK-NEXT: pushq
+; CHECK-NOT: pushq
+
+; The dynamic alloc (aligned):
+; CHECK: movl 32(%rbp), [[AMT:%.*]]
+; CHECK: movl %esp, [[TMP:%.*]]
+; CHECK-NEXT: addl $15, [[AMT]]
+; CHECK-NEXT: andl $-16, [[AMT]]
+; CHECK-NEXT: subl [[AMT]], [[TMP]]
+; Set the SP based on the final value of TMP.
+; CHECK-NEXT: naclrestsp_noflags [[TMP]], %r15
+
+; Make more room for call arguments:
+; CHECK: naclsspq $32, %r15
+; CHECK: callq callee
+
+; Restore stack pointer from frame pointer - 16. It is -16 because
+; the code still needs to pop the two pushed regs, before restoring
+; the frame pointer from the stack.
+; CHECK: naclspadj $-16, %r15
+; CHECK-NEXT: popq
+; CHECK-NEXT: popq
+; CHECK-NEXT: naclrestbp (%rsp), %r15
+; CHECK-NEXT: naclaspq $8, %r15