PPC: [wasm] Int64Lowering of I64Shl.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 3f8640a408fdf9b9393c78c164d387705424c0a9..2e3fafa09df51a87bc6cb251d92e96a972082abc 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -803,6 +803,52 @@ void MacroAssembler::ConvertDoubleToUnsignedInt64(
 }
 #endif
 
+#if !V8_TARGET_ARCH_PPC64
+void MacroAssembler::PairShiftLeft(Register dst_low, Register dst_high,
+                                   Register src_low, Register src_high,
+                                   Register scratch, Register shift) {
+  DCHECK(!AreAliased(dst_low, src_high, shift));
+  DCHECK(!AreAliased(dst_high, src_low, shift));
+  Label less_than_32;
+  Label done;
+  cmpi(shift, Operand(32));
+  blt(&less_than_32);
+  // If shift >= 32
+  andi(scratch, shift, Operand(0x1f));
+  slw(dst_high, src_low, scratch);
+  li(dst_low, Operand::Zero());
+  b(&done);
+  bind(&less_than_32);
+  // If shift < 32
+  subfic(scratch, shift, Operand(32));
+  slw(dst_high, src_high, shift);
+  srw(scratch, src_low, scratch);
+  orx(dst_high, dst_high, scratch);
+  slw(dst_low, src_low, shift);
+  bind(&done);
+}
+
+void MacroAssembler::PairShiftLeft(Register dst_low, Register dst_high,
+                                   Register src_low, Register src_high,
+                                   uint32_t shift) {
+  DCHECK(!AreAliased(dst_low, src_high));
+  DCHECK(!AreAliased(dst_high, src_low));
+  Label less_than_32;
+  Label done;
+  if (shift >= 32) {
+    shift &= 0x1f;
+    slwi(dst_high, src_low, Operand(shift));
+    li(dst_low, Operand::Zero());
+  } else if (shift == 0) {
+    Move(dst_low, src_low);
+    Move(dst_high, src_high);
+  } else {
+    slwi(dst_high, src_high, Operand(shift));
+    rlwimi(dst_high, src_low, shift, 32 - shift, 31);
+    slwi(dst_low, src_low, Operand(shift));
+  }
+}
+#endif
 
 void MacroAssembler::LoadConstantPoolPointerRegisterFromCodeTargetAddress(
     Register code_target_address) {