Hi all,
This patch resolves PR86014. It does so by noticing that the last load
may clobber the address register without issue (regardless of where it
exists in the final ldp/stp sequence). That check has been changed so
that the last register may be clobbered and the testcase
(gcc.target/aarch64/ldp_stp_10.c) now passes.
Bootstrap and regtest OK.
OK for trunk?
Jackson
Changelog:
gcc/
2018-06-25 Jackson Woodruff <jackson.woodr...@arm.com>
PR target/86014
* config/aarch64/aarch64.c (aarch64_operands_adjust_ok_for_ldpstp):
Remove address clobber check on last register.
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index d0e9b2d464183eecc8cc7639ca3e981d2ff243ba..feffe8ebdbd4efd0ffc09834547767ceec46f4e4 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -17074,7 +17074,7 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx *operands, bool load,
/* Only the last register in the order in which they occur
may be clobbered by the load. */
if (load)
- for (int i = 0; i < num_instructions; i++)
+ for (int i = 0; i < num_instructions - 1; i++)
if (reg_mentioned_p (reg[i], mem[i]))
return false;
