[PATCH] Don't report the error when non-dangerous load/store is in branch delay slot

[Sasa Stankovic]

I restored the orignal ordering.

http://reviews.llvm.org/D4048

Files:
  lib/Target/Mips/MCTargetDesc/MipsNaClELFStreamer.cpp
  test/MC/Mips/nacl-mask.s

Index: test/MC/Mips/nacl-mask.s
===================================================================
--- test/MC/Mips/nacl-mask.s
+++ test/MC/Mips/nacl-mask.s
@@ -283,3 +283,31 @@
 # CHECK-NEXT:        and     $25, $25, $14
 # CHECK-NEXT:        jalr    $25
 # CHECK-NEXT:        addiu   $4, $zero, 5
+
+
+
+# Test that we can put non-dangerous loads and stores in branch delay slot.
+
+	.align	4
+test6:
+	.set	noreorder
+
+        jal func1
+        sw      $4, 0($sp)
+
+        bal func2
+        lw      $5, 0($t8)
+
+        jalr $t9
+        sw      $sp, 0($sp)
+
+# CHECK-LABEL:   test6:
+
+# CHECK:             jal
+# CHECK-NEXT:        sw      $4, 0($sp)
+
+# CHECK:             bal
+# CHECK-NEXT:        lw      $5, 0($24)
+
+# CHECK:             jalr
+# CHECK-NEXT:        sw      $sp, 0($sp)
Index: lib/Target/Mips/MCTargetDesc/MipsNaClELFStreamer.cpp
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsNaClELFStreamer.cpp
+++ lib/Target/Mips/MCTargetDesc/MipsNaClELFStreamer.cpp
@@ -137,18 +137,17 @@
                                                     &IsStore);
     bool IsSPFirstOperand = isStackPointerFirstOperand(Inst);
     if (IsMemAccess || IsSPFirstOperand) {
-      if (PendingCall)
-        report_fatal_error("Dangerous instruction in branch delay slot!");
-
       bool MaskBefore = (IsMemAccess
                          && baseRegNeedsLoadStoreMask(Inst.getOperand(AddrIdx)
                                                           .getReg()));
       bool MaskAfter = IsSPFirstOperand && !IsStore;
-      if (MaskBefore || MaskAfter)
+      if (MaskBefore || MaskAfter) {
+        if (PendingCall)
+          report_fatal_error("Dangerous instruction in branch delay slot!");
         sandboxLoadStoreStackChange(Inst, AddrIdx, STI, MaskBefore, MaskAfter);
-      else
-        MipsELFStreamer::EmitInstruction(Inst, STI);
-      return;
+        return;
+      }
+      // fallthrough
     }
 
     // Sandbox calls by aligning call and branch delay to the bundle end.
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