Bug 1271968 - IonMonkey: MIPS: Merge MacroAssembler::ma_jal.

Tag: #1542

2 files changed, 26 insertions, 0 deletions

diff --git a/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp b/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
index a8b53e67c..97660299a 100644
--- a/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
+++ b/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
@@ -727,6 +727,30 @@ MacroAssemblerMIPSShared::ma_b(wasm::TrapDesc target, JumpKind jumpKind)
     bindLater(&label, target);
 }
 
+void
+MacroAssemblerMIPSShared::ma_jal(Label* label)
+{
+    if (label->bound()) {
+        // Generate the mixed jump.
+        addMixedJump(nextOffset(), ImmPtr((void*)label->offset()));
+        as_jal(JOffImm26(0));
+        as_nop();
+        return;
+    }
+
+    // Second word holds a pointer to the next branch in label's chain.
+    uint32_t nextInChain = label->used() ? label->offset() : LabelBase::INVALID_OFFSET;
+
+    // Make the whole branch continous in the buffer. The '2'
+    // instructions are writing at below (contain delay slot).
+    m_buffer.ensureSpace(2 * sizeof(uint32_t));
+
+    BufferOffset bo = as_jal(JOffImm26(0));
+    writeInst(nextInChain);
+    if (!oom())
+        label->use(bo.getOffset());
+}
+
 Assembler::Condition
 MacroAssemblerMIPSShared::ma_cmp(Register scratch, Register lhs, Register rhs, Condition c)
 {
diff --git a/js/src/jit/mips-shared/MacroAssembler-mips-shared.h b/js/src/jit/mips-shared/MacroAssembler-mips-shared.h
index 0fa73b616..b761c3e9e 100644
--- a/js/src/jit/mips-shared/MacroAssembler-mips-shared.h
+++ b/js/src/jit/mips-shared/MacroAssembler-mips-shared.h
@@ -164,6 +164,8 @@ class MacroAssemblerMIPSShared : public Assembler
     void ma_b(Label* l, JumpKind jumpKind = MixedJump);
     void ma_b(wasm::TrapDesc target, JumpKind jumpKind = MixedJump);
 
+    void ma_jal(Label* l);
+
     // fp instructions
     void ma_lis(FloatRegister dest, float value);
     void ma_lis(FloatRegister dest, wasm::RawF32 value);