The errata fix for the UT699 fdivd and fsqrtd might cause a sequence
that can trigger the b2bst errata. Adding a NOP prevents this.
gcc/ChangeLog:
2017-07-11 Daniel Cederman <ceder...@gaisler.com>
* config/sparc/sparc.md (divdf3_fix): Add NOP to prevent back
to back store errata sensitive sequence from being generated.
(sqrtdf2_fix): Likewise.
---
gcc/config/sparc/sparc.md | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/gcc/config/sparc/sparc.md b/gcc/config/sparc/sparc.md
index afdc7d1..b154003 100644
--- a/gcc/config/sparc/sparc.md
+++ b/gcc/config/sparc/sparc.md
@@ -6171,10 +6171,10 @@ visl")
(div:DF (match_operand:DF 1 "register_operand" "e")
(match_operand:DF 2 "register_operand" "e")))]
"TARGET_FPU && sparc_fix_ut699"
- "fdivd\t%1, %2, %0\n\tstd\t%0, [%%sp-8]"
+ "fdivd\t%1, %2, %0\n\tstd\t%0, [%%sp-8]\n\tnop"
[(set_attr "type" "fpdivd")
(set_attr "fptype" "double")
- (set_attr "length" "2")])
+ (set_attr "length" "3")])
(define_insn "divsf3"
[(set (match_operand:SF 0 "register_operand" "=f")
@@ -6423,10 +6423,10 @@ visl")
[(set (match_operand:DF 0 "register_operand" "=e")
(sqrt:DF (match_operand:DF 1 "register_operand" "e")))]
"TARGET_FPU && sparc_fix_ut699"
- "fsqrtd\t%1, %0\n\tstd\t%0, [%%sp-8]"
+ "fsqrtd\t%1, %0\n\tstd\t%0, [%%sp-8]\n\tnop"
[(set_attr "type" "fpsqrtd")
(set_attr "fptype" "double")
- (set_attr "length" "2")])
+ (set_attr "length" "3")])
(define_insn "sqrtsf2"
[(set (match_operand:SF 0 "register_operand" "=f")
--
2.9.3
