summaryrefslogtreecommitdiffstats
path: root/js/src/jit/x64/SharedIC-x64.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'js/src/jit/x64/SharedIC-x64.cpp')
-rw-r--r--js/src/jit/x64/SharedIC-x64.cpp234
1 files changed, 234 insertions, 0 deletions
diff --git a/js/src/jit/x64/SharedIC-x64.cpp b/js/src/jit/x64/SharedIC-x64.cpp
new file mode 100644
index 000000000..9e5898c3d
--- /dev/null
+++ b/js/src/jit/x64/SharedIC-x64.cpp
@@ -0,0 +1,234 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jit/BaselineIC.h"
+#include "jit/SharedICHelpers.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+namespace js {
+namespace jit {
+
+// ICBinaryArith_Int32
+
+bool
+ICBinaryArith_Int32::Compiler::generateStubCode(MacroAssembler& masm)
+{
+ // Guard that R0 is an integer and R1 is an integer.
+ Label failure;
+ masm.branchTestInt32(Assembler::NotEqual, R0, &failure);
+ masm.branchTestInt32(Assembler::NotEqual, R1, &failure);
+
+ // The scratch register is only used in the case of JSOP_URSH.
+ mozilla::Maybe<ScratchRegisterScope> scratch;
+
+ Label revertRegister, maybeNegZero;
+ switch(op_) {
+ case JSOP_ADD:
+ masm.unboxInt32(R0, ExtractTemp0);
+ // Just jump to failure on overflow. R0 and R1 are preserved, so we can just jump to
+ // the next stub.
+ masm.addl(R1.valueReg(), ExtractTemp0);
+ masm.j(Assembler::Overflow, &failure);
+
+ // Box the result
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ break;
+ case JSOP_SUB:
+ masm.unboxInt32(R0, ExtractTemp0);
+ masm.subl(R1.valueReg(), ExtractTemp0);
+ masm.j(Assembler::Overflow, &failure);
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ break;
+ case JSOP_MUL:
+ masm.unboxInt32(R0, ExtractTemp0);
+ masm.imull(R1.valueReg(), ExtractTemp0);
+ masm.j(Assembler::Overflow, &failure);
+
+ masm.branchTest32(Assembler::Zero, ExtractTemp0, ExtractTemp0, &maybeNegZero);
+
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ break;
+ case JSOP_DIV:
+ {
+ MOZ_ASSERT(R2.scratchReg() == rax);
+ MOZ_ASSERT(R0.valueReg() != rdx);
+ MOZ_ASSERT(R1.valueReg() != rdx);
+ masm.unboxInt32(R0, eax);
+ masm.unboxInt32(R1, ExtractTemp0);
+
+ // Prevent division by 0.
+ masm.branchTest32(Assembler::Zero, ExtractTemp0, ExtractTemp0, &failure);
+
+ // Prevent negative 0 and -2147483648 / -1.
+ masm.branch32(Assembler::Equal, eax, Imm32(INT32_MIN), &failure);
+
+ Label notZero;
+ masm.branch32(Assembler::NotEqual, eax, Imm32(0), &notZero);
+ masm.branchTest32(Assembler::Signed, ExtractTemp0, ExtractTemp0, &failure);
+ masm.bind(&notZero);
+
+ // Sign extend eax into edx to make (edx:eax), since idiv is 64-bit.
+ masm.cdq();
+ masm.idiv(ExtractTemp0);
+
+ // A remainder implies a double result.
+ masm.branchTest32(Assembler::NonZero, edx, edx, &failure);
+
+ masm.boxValue(JSVAL_TYPE_INT32, eax, R0.valueReg());
+ break;
+ }
+ case JSOP_MOD:
+ {
+ MOZ_ASSERT(R2.scratchReg() == rax);
+ MOZ_ASSERT(R0.valueReg() != rdx);
+ MOZ_ASSERT(R1.valueReg() != rdx);
+ masm.unboxInt32(R0, eax);
+ masm.unboxInt32(R1, ExtractTemp0);
+
+ // x % 0 always results in NaN.
+ masm.branchTest32(Assembler::Zero, ExtractTemp0, ExtractTemp0, &failure);
+
+ // Prevent negative 0 and -2147483648 % -1.
+ masm.branchTest32(Assembler::Zero, eax, Imm32(0x7fffffff), &failure);
+
+ // Sign extend eax into edx to make (edx:eax), since idiv is 64-bit.
+ masm.cdq();
+ masm.idiv(ExtractTemp0);
+
+ // Fail when we would need a negative remainder.
+ Label done;
+ masm.branchTest32(Assembler::NonZero, edx, edx, &done);
+ masm.orl(ExtractTemp0, eax);
+ masm.branchTest32(Assembler::Signed, eax, eax, &failure);
+
+ masm.bind(&done);
+ masm.boxValue(JSVAL_TYPE_INT32, edx, R0.valueReg());
+ break;
+ }
+ case JSOP_BITOR:
+ // We can overide R0, because the instruction is unfailable.
+ // Because the tag bits are the same, we don't need to retag.
+ masm.orq(R1.valueReg(), R0.valueReg());
+ break;
+ case JSOP_BITXOR:
+ masm.xorl(R1.valueReg(), R0.valueReg());
+ masm.tagValue(JSVAL_TYPE_INT32, R0.valueReg(), R0);
+ break;
+ case JSOP_BITAND:
+ masm.andq(R1.valueReg(), R0.valueReg());
+ break;
+ case JSOP_LSH:
+ masm.unboxInt32(R0, ExtractTemp0);
+ masm.unboxInt32(R1, ecx); // Unboxing R1 to ecx, clobbers R0.
+ masm.shll_cl(ExtractTemp0);
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ break;
+ case JSOP_RSH:
+ masm.unboxInt32(R0, ExtractTemp0);
+ masm.unboxInt32(R1, ecx);
+ masm.sarl_cl(ExtractTemp0);
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ break;
+ case JSOP_URSH:
+ if (!allowDouble_) {
+ scratch.emplace(masm);
+ masm.movq(R0.valueReg(), *scratch);
+ }
+
+ masm.unboxInt32(R0, ExtractTemp0);
+ masm.unboxInt32(R1, ecx); // This clobbers R0
+
+ masm.shrl_cl(ExtractTemp0);
+ masm.test32(ExtractTemp0, ExtractTemp0);
+ if (allowDouble_) {
+ Label toUint;
+ masm.j(Assembler::Signed, &toUint);
+
+ // Box and return.
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ EmitReturnFromIC(masm);
+
+ masm.bind(&toUint);
+ ScratchDoubleScope scratchDouble(masm);
+ masm.convertUInt32ToDouble(ExtractTemp0, scratchDouble);
+ masm.boxDouble(scratchDouble, R0);
+ } else {
+ masm.j(Assembler::Signed, &revertRegister);
+ masm.boxValue(JSVAL_TYPE_INT32, ExtractTemp0, R0.valueReg());
+ }
+ break;
+ default:
+ MOZ_CRASH("Unhandled op in BinaryArith_Int32");
+ }
+
+ // Return from stub.
+ EmitReturnFromIC(masm);
+
+ if (op_ == JSOP_MUL) {
+ masm.bind(&maybeNegZero);
+
+ // Result is -0 if exactly one of lhs or rhs is negative.
+ {
+ ScratchRegisterScope scratch(masm);
+ masm.movl(R0.valueReg(), scratch);
+ masm.orl(R1.valueReg(), scratch);
+ masm.j(Assembler::Signed, &failure);
+ }
+
+ // Result is +0.
+ masm.moveValue(Int32Value(0), R0);
+ EmitReturnFromIC(masm);
+ }
+
+ // Revert the content of R0 in the fallible >>> case.
+ if (op_ == JSOP_URSH && !allowDouble_) {
+ // Scope continuation from JSOP_URSH case above.
+ masm.bind(&revertRegister);
+ // Restore tag and payload.
+ masm.movq(*scratch, R0.valueReg());
+ // Fall through to failure.
+ }
+ // Failure case - jump to next stub
+ masm.bind(&failure);
+ EmitStubGuardFailure(masm);
+
+ return true;
+}
+
+bool
+ICUnaryArith_Int32::Compiler::generateStubCode(MacroAssembler& masm)
+{
+ Label failure;
+ masm.branchTestInt32(Assembler::NotEqual, R0, &failure);
+
+ switch (op) {
+ case JSOP_BITNOT:
+ masm.notl(R0.valueReg());
+ break;
+ case JSOP_NEG:
+ // Guard against 0 and MIN_INT, both result in a double.
+ masm.branchTest32(Assembler::Zero, R0.valueReg(), Imm32(0x7fffffff), &failure);
+ masm.negl(R0.valueReg());
+ break;
+ default:
+ MOZ_CRASH("Unexpected op");
+ }
+
+ masm.tagValue(JSVAL_TYPE_INT32, R0.valueReg(), R0);
+
+ EmitReturnFromIC(masm);
+
+ masm.bind(&failure);
+ EmitStubGuardFailure(masm);
+ return true;
+}
+
+} // namespace jit
+} // namespace js
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-11 09:09:19 +0000