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* [gcc r14-9103] aarch64: More SME vs -mtrack-speculation
@ 2024-02-21 11:13 Richard Sandiford
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From: Richard Sandiford @ 2024-02-21 11:13 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:38004cf8699a82790d83846e3bd37e151e709ede
commit r14-9103-g38004cf8699a82790d83846e3bd37e151e709ede
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed Feb 21 11:12:29 2024 +0000
aarch64: More SME vs -mtrack-speculation
The sequence to commit a lazy save includes a branch based on
whether TPIDR2_EL0 is zero. The code assumed that CBZ could
be used for this, but that instruction is forbidden when
-mtrack-speculation is being used.
gcc/
* config/aarch64/aarch64.cc (aarch64_mode_emit_local_sme_state):
Use aarch64_gen_compare_zero_and_branch rather than emitting
a CBZ directly.
gcc/testsuite/
* gcc.target/aarch64/sme/locally_streaming_1_ts.c: New test.
* gcc.target/aarch64/sme/sibcall_7_ts.c: Likewise.
Diff:
---
gcc/config/aarch64/aarch64.cc | 3 ++-
gcc/testsuite/gcc.target/aarch64/sme/locally_streaming_1_ts.c | 3 +++
gcc/testsuite/gcc.target/aarch64/sme/sibcall_7_ts.c | 3 +++
3 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 8a3aa98a32e9..28d1555dada9 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -29344,7 +29344,8 @@ aarch64_mode_emit_local_sme_state (aarch64_local_sme_state mode,
auto tmp_reg = gen_reg_rtx (DImode);
emit_insn (gen_aarch64_read_tpidr2 (tmp_reg));
auto label = gen_label_rtx ();
- auto jump = emit_jump_insn (gen_aarch64_cbeqdi1 (tmp_reg, label));
+ rtx branch = aarch64_gen_compare_zero_and_branch (EQ, tmp_reg, label);
+ auto jump = emit_jump_insn (branch);
JUMP_LABEL (jump) = label;
emit_insn (gen_aarch64_tpidr2_save ());
emit_insn (gen_aarch64_clear_tpidr2 ());
diff --git a/gcc/testsuite/gcc.target/aarch64/sme/locally_streaming_1_ts.c b/gcc/testsuite/gcc.target/aarch64/sme/locally_streaming_1_ts.c
new file mode 100644
index 000000000000..25ac345a6dda
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sme/locally_streaming_1_ts.c
@@ -0,0 +1,3 @@
+// { dg-options "-O -fomit-frame-pointer -mtrack-speculation" }
+
+#include "locally_streaming_1.c"
diff --git a/gcc/testsuite/gcc.target/aarch64/sme/sibcall_7_ts.c b/gcc/testsuite/gcc.target/aarch64/sme/sibcall_7_ts.c
new file mode 100644
index 000000000000..4b47678bf009
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sme/sibcall_7_ts.c
@@ -0,0 +1,3 @@
+// { dg-options "-O2 -mtrack-speculation" }
+
+#include "sibcall_7.c"
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