[PATCH] perf llvm: Specify features="+all" for aarch64
From: Peter Collingbourne
Date: Tue Mar 03 2026 - 18:01:46 EST
This is consistent with what llvm-objdump does (see [1]) and allows
the LLVM disassembler to disassemble instructions not in the base
instruction set.
[1] https://reviews.llvm.org/D127741
Link: https://linux-review.googlesource.com/id/I52e4fef18d2e12b45f875231fa9d3efff2538fd4
Signed-off-by: Peter Collingbourne <pcc@xxxxxxxxxx>
---
tools/perf/util/llvm.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/llvm.c b/tools/perf/util/llvm.c
index 87fceae8488a7..44eff99970fe2 100644
--- a/tools/perf/util/llvm.c
+++ b/tools/perf/util/llvm.c
@@ -153,11 +153,17 @@ int symbol__disassemble_llvm(const char *filename, struct symbol *sym,
/*get_op_info=*/NULL, symbol_lookup_callback);
} else {
char triplet[64];
+ const char *features = NULL;
scnprintf(triplet, sizeof(triplet), "%s-linux-gnu",
args->arch->name);
- disasm = LLVMCreateDisasm(triplet, &storage, /*tag_type=*/0,
- /*get_op_info=*/NULL, symbol_lookup_callback);
+ if (args->arch->id.e_machine == EM_AARCH64)
+ features = "+all";
+ disasm = LLVMCreateDisasmCPUFeatures(triplet, /*cpu=*/"",
+ features, &storage,
+ /*tag_type=*/0,
+ /*get_op_info=*/NULL,
+ symbol_lookup_callback);
}
if (disasm == NULL)
--
2.53.0.473.g4a7958ca14-goog