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[SPARC] Errata workaround for GRLIB-TN-0011 

This patch provides a workaround for the errata described in GRLIB-TN-0011.

If the workaround is enabled it will:

 * Insert .align 16 before atomic instructions (swap, ldstub, casa).

It is applicable to GR712RC.

2017-11-29  Daniel Cederman  <cederman@gaisler.com>

gcc/
	* config/sparc/sync.md (swapsi): 16-byte align if sparc_fix_gr712rc.
	(atomic_compare_and_swap_leon3_1): Likewise.
	(ldstub): Likewise.

From-SVN: r255235
This commit is contained in:
Daniel Cederman 2017-11-29 15:20:48 +00:00 committed by Daniel Hellstrom
parent dcacda0cc1
commit aed173734d
2 changed files with 29 additions and 5 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2017-11-29 Daniel Cederman <cederman@gaisler.com>
* config/sparc/sync.md (swapsi): 16-byte align if sparc_fix_gr712rc.
(atomic_compare_and_swap_leon3_1): Likewise.
(ldstub): Likewise.
2017-11-29 Daniel Cederman <cederman@gaisler.com>
* config/sparc/sparc.c (fpop_insn_p): New function.

28
gcc/config/sparc/sync.md
View File

@ -222,12 +222,16 @@
UNSPECV_CAS))]
"TARGET_LEON3"
{
if (sparc_fix_gr712rc)
output_asm_insn (".align\t16", operands);
if (TARGET_SV_MODE)
return "casa\t%1 0xb, %2, %0"; /* ASI for supervisor data space. */
else
return "casa\t%1 0xa, %2, %0"; /* ASI for user data space. */
}
[(set_attr "type" "multi")])
[(set_attr "type" "multi")
(set (attr "length") (if_then_else (eq_attr "fix_gr712rc" "true")
(const_int 4) (const_int 1)))])
(define_insn "*atomic_compare_and_swapdi_v8plus"
[(set (match_operand:DI 0 "register_operand" "=h")
@ -275,8 +279,15 @@
(set (match_dup 1)
(match_operand:SI 2 "register_operand" "0"))]
"(TARGET_V8 || TARGET_V9) && !sparc_fix_ut699"
"swap\t%1, %0"
[(set_attr "type" "multi")])
{
if (sparc_fix_gr712rc)
return ".align\t16\n\tswap\t%1, %0";
else
return "swap\t%1, %0";
}
[(set_attr "type" "multi")
(set (attr "length") (if_then_else (eq_attr "fix_gr712rc" "true")
(const_int 4) (const_int 1)))])
(define_expand "atomic_test_and_set"
[(match_operand:QI 0 "register_operand" "")
@ -307,5 +318,12 @@
UNSPECV_LDSTUB))
(set (match_dup 1) (const_int -1))]
"!sparc_fix_ut699"
"ldstub\t%1, %0"
[(set_attr "type" "multi")])
{
if (sparc_fix_gr712rc)
return ".align\t16\n\tldstub\t%1, %0";
else
return "ldstub\t%1, %0";
}
[(set_attr "type" "multi")
(set (attr "length") (if_then_else (eq_attr "fix_gr712rc" "true")
(const_int 4) (const_int 1)))])