//
// Macros indicating available Google Test features (defined to 1 if
// the corresponding feature is supported; otherwise undefined):
//   GTEST_HAS_COMBINE      - the Combine() function (for value-parameterized
//                            tests)
//   GTEST_HAS_DEATH_TEST   - death tests
//   GTEST_HAS_PARAM_TEST   - value-parameterized tests
//   GTEST_HAS_TYPED_TEST   - typed tests

//
// Macros indicating available Google Test features (defined to 1 if
// the corresponding feature is supported; otherwise undefined):
//   GTEST_HAS_COMBINE      - the Combine() function (for value-parameterized
//                            tests)
//   GTEST_HAS_DEATH_TEST   - death tests
//   GTEST_HAS_PARAM_TEST   - value-parameterized tests
//   GTEST_HAS_TYPED_TEST   - typed tests

(Sub(Ptr|64|32|16|8) ...) => (SUB ...)
(Sub32F ...) => (FSUBS ...)
(Sub64F ...) => (FSUB ...)

(Min(32|64)F x y) && buildcfg.GOPPC64 >= 9 => (XSMINJDP x y)
(Max(32|64)F x y) && buildcfg.GOPPC64 >= 9 => (XSMAXJDP x y)

// Combine 64 bit integer multiply and adds
(ADD l:(MULLD x y) z) && buildcfg.GOPPC64 >= 9 && l.Uses == 1 && clobber(l) => (MADDLD x y z)

(Mod16 x y) => (Mod32 (SignExt16to32 x) (SignExt16to32 y))

    /**
     * <p>Creates a new {@code FileTree} which contains the contents of the given ZIP file. The given zipPath path is
     * evaluated as per {@link #file(Object)}. You can combine this method with the {@link #copy(Action)}
     * method to unzip a ZIP file.</p>
     *
     * <p>The returned file tree is lazy, so that it scans for files only when the contents of the file tree are

	// xor with seed
	PXOR	X0, X2
	PXOR	X1, X3

	// scramble 3 times
	AESENC	X2, X2
	AESENC	X3, X3
	AESENC	X2, X2
	AESENC	X3, X3
	AESENC	X2, X2
	AESENC	X3, X3

	// combine results
	PXOR	X3, X2
	MOVQ	X2, AX	// return X2
	RET

aes33to64:
	// make 3 more starting seeds
	MOVO	X1, X2
	MOVO	X1, X3
	PXOR	runtime·aeskeysched+16(SB), X1

// combine add/shift into LEAQ/LEAL
(ADD(L|Q) x (SHL(L|Q)const [3] y)) => (LEA(L|Q)8 x y)
(ADD(L|Q) x (SHL(L|Q)const [2] y)) => (LEA(L|Q)4 x y)
(ADD(L|Q) x (SHL(L|Q)const [1] y)) => (LEA(L|Q)2 x y)
(ADD(L|Q) x (ADD(L|Q) y y))        => (LEA(L|Q)2 x y)
(ADD(L|Q) x (ADD(L|Q) x y))        => (LEA(L|Q)2 y x)

// combine ADDQ/ADDQconst into LEAQ1/LEAL1

====

You can also see at the end of the example _how to combine file collections_ using the `+` and `-` operators to merge and subtract them.
An important feature of the resulting file collections is that they are _live_.
In other words, when you combine file collections this way, the result always reflects what's currently in the source file collections, even if they change during the build.

// Fold sign and zero extensions into loads.
//
// Note: The combined instruction must end up in the same block
// as the original load. If not, we end up making a value with
// memory type live in two different blocks, which can lead to
// multiple memory values alive simultaneously.
//
// Make sure we don't combine these ops if the load has another use.

// Lowers ResizeNearestNeighbor to an indices computations with a gather along
// the combined spatial dimensions. Generating the indices along the
// width/height index could be used to gather along each of W and H dimension
// of the input image array. To reduce to a single gather, these indices are
// combined, so a single gather can be performed along the combined spatial
// dimensions.
//

}

// combinesWithName reports whether a name followed by the expression x
// syntactically combines to another valid (value) expression. For instance
// using *T for x, "name *T" syntactically appears as the expression x*T.
// On the other hand, using  P|Q or *P|~Q for x, "name P|Q" or name *P|~Q"
// cannot be combined into a valid (value) expression.
func combinesWithName(x ast.Expr) bool {
	switch x := x.(type) {