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[v2,2/8] RISCV: Enforce Libatomic LR/SC SEQ_CST

Message ID 20230405210118.1969283-3-patrick@rivosinc.com
State Accepted
Headers
Series RISCV: Implement ISA Manual Table A.6 Mappings |

Checks

Context Check Description
snail/gcc-patch-check success Github commit url

Commit Message

Patrick O'Neill April 5, 2023, 9:01 p.m. UTC 
  Replace LR.aq/SC.rl pairs with the SEQ_CST LR.aqrl/SC.rl pairs
recommended by table A.6 of the ISA manual.

2023-04-05 Patrick O'Neill <patrick@rivosinc.com>

	* atomic.c: Change LR.aq/SC.rl pairs into sequentially
	consistent LR.aqrl/SC.rl pair.

Signed-off-by: Patrick O'Neill <patrick@rivosinc.com>
---
 libgcc/config/riscv/atomic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/libgcc/config/riscv/atomic.c b/libgcc/config/riscv/atomic.c
index 69f53623509..5f895939b0b 100644
--- a/libgcc/config/riscv/atomic.c
+++ b/libgcc/config/riscv/atomic.c
@@ -39,7 +39,7 @@  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     unsigned old, tmp1, tmp2;						\
 									\
     asm volatile ("1:\n\t"						\
-		  "lr.w.aq %[old], %[mem]\n\t"				\
+		  "lr.w.aqrl %[old], %[mem]\n\t"			\
 		  #insn " %[tmp1], %[old], %[value]\n\t"		\
 		  invert						\
 		  "and %[tmp1], %[tmp1], %[mask]\n\t"			\
@@ -73,7 +73,7 @@  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     unsigned old, tmp1;							\
 									\
     asm volatile ("1:\n\t"						\
-		  "lr.w.aq %[old], %[mem]\n\t"				\
+		  "lr.w.aqrl %[old], %[mem]\n\t"			\
 		  "and %[tmp1], %[old], %[mask]\n\t"			\
 		  "bne %[tmp1], %[o], 1f\n\t"				\
 		  "and %[tmp1], %[old], %[not_mask]\n\t"		\