{"VADDPD.RZ_SAE.SAE X0, X1, X2", `bad suffix combination`},

		// BSWAP on 16-bit registers is undefined. See #29167,
		{"BSWAPW DX", `unrecognized instruction`},
		{"BSWAPW R11", `unrecognized instruction`},
	})
}

func testBadInstParser(t *testing.T, goarch string, tests []badInstTest) {
	for i, test := range tests {
		arch, ctxt := setArch(goarch)

	SQRTF	F0, F1        // c01ab1ee
	SQRTD	F4, F5        // c45bb1ee
	MOVFD	F0, F1        // c01ab7ee
	MOVDF	F4, F5        // c45bb7ee

	LDREX	(R8), R9      // 9f9f98e1
	LDREXB	(R11), R12    // 9fcfdbe1
	LDREXD	(R11), R12    // 9fcfbbe1
	STREX	R3, (R4), R5  // STREX  (R4), R3, R5 // 935f84e1
	STREXB	R8, (R9), g   // STREXB (R9), R8, g  // 98afc9e1
	STREXD	R8, (R9), g   // STREXD (R9), R8, g  // 98afa9e1

	STP.P	(R1, R2), 8(R2)                                  // ERROR "constrained unpredictable behavior"
	STLXP	(R6, R11), (RSP), R6                             // ERROR "constrained unpredictable behavior"
	STXP	(R6, R11), (R2), R2                              // ERROR "constrained unpredictable behavior"
	STLXR	R3, (RSP), R3                                    // ERROR "constrained unpredictable behavior"

that may not be expressible using a single hardware instruction.
It implements these forms as multiple instructions, often using the <code>R11</code> register
to hold temporary values.
Hand-written assembly can use <code>R11</code>, but doing so requires
being sure that the linker is not also using it to implement any of the other
instructions in the function.
</p>

<p>

pkg debug/macho, type RegsAMD64 struct, GS uint64
pkg debug/macho, type RegsAMD64 struct, IP uint64
pkg debug/macho, type RegsAMD64 struct, R10 uint64
pkg debug/macho, type RegsAMD64 struct, R11 uint64
pkg debug/macho, type RegsAMD64 struct, R12 uint64
pkg debug/macho, type RegsAMD64 struct, R13 uint64
pkg debug/macho, type RegsAMD64 struct, R14 uint64
pkg debug/macho, type RegsAMD64 struct, R15 uint64