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* config/tc-mips.c (mips_optimize): New static variable. 

(append_insn): If ! mips_optimize, don't swap branches.
	(md_parse_option): If -Ox, set mips_optimize accordingly.
This commit is contained in:
Ian Lance Taylor 1993-07-27 15:55:35 +00:00
parent 4fe45d2254
commit 4e95866e2c
1 changed files with 49 additions and 3 deletions
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52
gas/config/tc-mips.c
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@ -102,6 +102,11 @@ static symbolS *insn_label;
/* To output NOP instructions correctly, we need to keep information
about the previous two instructions. */
/* Whether we are optimizing. We always optimize unless -O0 is given.
For the very simple optimizations we do, this is compatible with
the MIPS assembler. */
static int mips_optimize = 1;
/* The previous instruction. */
static struct mips_cl_insn prev_insn;
@ -126,6 +131,13 @@ static fixS *prev_insn_fixp;
/* Non-zero if the previous instruction was in a delay slot. */
static int prev_insn_is_delay_slot;
/* Non-zero if the previous instruction was in a .set noreorder. */
static int prev_insn_unreordered;
/* Non-zero if the previous previous instruction was in a .set
noreorder. */
static int prev_prev_insn_unreordered;
/* Prototypes for static functions. */
@ -613,15 +625,33 @@ append_insn (ip, address_expr, reloc_type)
if ((ip->insn_mo->pinfo & INSN_UNCOND_BRANCH_DELAY)
|| (ip->insn_mo->pinfo & INSN_COND_BRANCH_DELAY))
{
/* If we had to emit any NOP instructions, then we already
know we can not swap. */
if (nops != 0
if (! mips_optimize
/* If we had to emit any NOP instructions, then we
already know we can not swap. */
|| nops != 0
/* If we don't even know the previous insn, we can not
swap. */
|| ! prev_insn_valid
/* If the previous insn is already in a branch delay
slot, then we can not swap. */
|| prev_insn_is_delay_slot
/* If the previous previous insn was in a .set
noreorder, we can't swap. Actually, the MIPS
assembler will swap in this situation. However, gcc
configured -with-gnu-as will generate code like
.set noreorder
lw $4,XXX
.set reorder
INSN
bne $4,$0,foo
in which we can not swap the bne and INSN. If gcc is
not configured -with-gnu-as, it does not output the
.set pseudo-ops. We don't have to check
prev_insn_unreordered, because prev_insn_valid will
be 0 in that case. We don't want to use
prev_prev_insn_valid, because we do want to be able
to swap at the start of a function. */
|| prev_prev_insn_unreordered
/* If the branch is itself the target of a branch, we
can not swap. We cheat on this; all we check for is
whether there is a label on this instruction. If
@ -738,6 +768,8 @@ append_insn (ip, address_expr, reloc_type)
prev_insn_is_delay_slot = 0;
}
prev_prev_insn_unreordered = prev_insn_unreordered;
prev_insn_unreordered = 0;
prev_insn_frag = frag_now;
prev_insn_where = f - frag_now->fr_literal;
prev_insn_fixp = fixp;
@ -758,6 +790,8 @@ mips_no_prev_insn ()
prev_prev_insn.insn_mo = &dummy_opcode;
prev_insn_valid = 0;
prev_insn_is_delay_slot = 0;
prev_insn_unreordered = 0;
prev_prev_insn_unreordered = 0;
insn_label = NULL;
}
@ -2965,6 +2999,12 @@ md_parse_option (argP, cntP, vecP)
return 1;
}
if (**argP == 'O')
{
mips_optimize = (*argP)[1] != '0';
return 1;
}
#ifdef OBJ_ECOFF
if (**argP == 'G')
{
@ -2983,6 +3023,7 @@ md_parse_option (argP, cntP, vecP)
return 1;
}
#endif
return 1; /* pretend you parsed the character */
}
@ -3356,6 +3397,11 @@ s_mipsset (x)
if (strcmp (name, "reorder") == 0)
{
if (mips_noreorder)
{
prev_insn_unreordered = 1;
prev_prev_insn_unreordered = 1;
}
mips_noreorder = 0;
}
else if (strcmp (name, "noreorder") == 0)