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Changeset 1380

Timestamp:

12/14/09 08:12:51 (15 years ago)

Author:

walter

Message:

bugzilla 3593 IntegerExpression? rule unspecified

Files:

r1372	r1380
19	19	passing conventions, etc.
20	20	)
21	21
22	22	$(P This document describes the x86 implementation of the inline
23	23	assembler.
24	24	)
25	25
26	26	$(GRAMMAR
27	27	$(GNAME AsmInstruction):
28	28	$(I Identifier) $(B :) $(I AsmInstruction)
29		$(B align) $(I IntegerExpression)
	29	$(B align) $(GLINK IntegerExpression)
30	30	$(B even)
31	31	$(B naked)
32	32	$(B db) $(I Operands)
33	33	$(B ds) $(I Operands)
34	34	$(B di) $(I Operands)
35	35	$(B dl) $(I Operands)
36	36	$(B df) $(I Operands)
37	37	$(B dd) $(I Operands)
38	38	$(B de) $(I Operands)
39	39	$(I Opcode)
…	…
57	57	{
58	58	call L1 ;
59	59	L1: ;
60	60	pop EBX ;
61	61	mov pc[EBP],EBX ; // pc now points to code at L1
62	62	}
63	63	--------------
64	64
65	65	<h2>align $(I IntegerExpression)</h2>
66	66
	67	$(GRAMMAR
	68	$(GNAME IntegerExpression):
	69	$(I IntegerLiteral)
	70	$(I Identifier)
	71	)
	72
67	73	$(P Causes the assembler to emit NOP instructions to align the next
68	74	assembler instruction on an $(I IntegerExpression) boundary.
69		$(I IntegerExpression) must evaluate to an integer that is
	75	$(I IntegerExpression) must evaluate at compile time to an integer that is
70	76	a power of 2.
71	77	)
72	78
73	79	$(P Aligning the start of a loop body can sometimes have a dramatic
74	80	effect on the execution speed.
75	81	)
76	82
77	83	<h2>even</h2>
78	84
79	85	$(P Causes the assembler to emit NOP instructions to align the next