src/runtime/test_amd64.s - go - Git at Google

 // Create a large frame to force stack growth. See #62326.
 TEXT ·testSPWrite(SB),0,$16384-0
 	// Write to SP
 	MOVQ SP, AX
 	ANDQ $~0xf, SP
 	MOVQ AX, SP
 	RET
	// Create a large frame to force stack growth. See #62326.
	TEXT ·testSPWrite(SB),0,$16384-0
	// Write to SP
	MOVQ SP, AX
	ANDQ $~0xf, SP
	MOVQ AX, SP
	RET