Revert "[llvm-exegesis][AArch64] Disable pauth and ldgm as unsupported instructions fixed (#136868)" #142382
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…d instructions fixed (llvm#136868)" This reverts commit 475531b. But it does not revert the changes from commits 36850a0 and 5dc3cd0.
|
@llvm/pr-subscribers-tools-llvm-exegesis Author: Tulio Magno Quites Machado Filho (tuliom) ChangesThis reverts commit 475531b. But it does not revert the changes from commits Full diff: https://github.com/llvm/llvm-project/pull/142382.diff 2 Files Affected:
diff --git a/llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s b/llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s
deleted file mode 100644
index 72009756ed1d5..0000000000000
--- a/llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s
+++ /dev/null
@@ -1,14 +0,0 @@
-llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s
-
-# TODO: This is failing on some systems that have hardware support for
-# pointer authentication. This needs to be fixed before reenabling.
-# REQUIRES: disabled
-
-# REQUIRES: aarch64-registered-target
-
-# Check for skipping of illegal instruction errors (AUT and LDGM)
-# RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --opcode-name=AUTIA --benchmark-phase=assemble-measured-code 2>&1 | FileCheck %s --check-prefix=CHECK-AUTIA
-# CHECK-AUTIA-NOT: snippet crashed while running: Illegal instruction
-
-# RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --opcode-name=LDGM --benchmark-phase=assemble-measured-code 2>&1 | FileCheck %s --check-prefix=CHECK-LDGM
-# CHECK-LDGM: LDGM: Unsupported opcode: load tag multiple
diff --git a/llvm/tools/llvm-exegesis/lib/AArch64/Target.cpp b/llvm/tools/llvm-exegesis/lib/AArch64/Target.cpp
index a1eb5a46f21fc..d6f4c5220f71d 100644
--- a/llvm/tools/llvm-exegesis/lib/AArch64/Target.cpp
+++ b/llvm/tools/llvm-exegesis/lib/AArch64/Target.cpp
@@ -12,12 +12,6 @@
#if defined(__aarch64__) && defined(__linux__)
#include <linux/prctl.h> // For PR_PAC_* constants
#include <sys/prctl.h>
-#ifndef PR_PAC_SET_ENABLED_KEYS
-#define PR_PAC_SET_ENABLED_KEYS 60
-#endif
-#ifndef PR_PAC_GET_ENABLED_KEYS
-#define PR_PAC_GET_ENABLED_KEYS 61
-#endif
#ifndef PR_PAC_APIAKEY
#define PR_PAC_APIAKEY (1UL << 0)
#endif
@@ -38,47 +32,6 @@
namespace llvm {
namespace exegesis {
-bool isPointerAuth(unsigned Opcode) {
- switch (Opcode) {
- default:
- return false;
-
- // FIXME: Pointer Authentication instructions.
- // We would like to measure these instructions, but they can behave
- // differently on different platforms, and maybe the snippets need to look
- // different for these instructions,
- // Platform-specific handling: On Linux, we disable authentication, may
- // interfere with measurements. On non-Linux platforms, disable opcodes for
- // now.
- case AArch64::AUTDA:
- case AArch64::AUTDB:
- case AArch64::AUTDZA:
- case AArch64::AUTDZB:
- case AArch64::AUTIA:
- case AArch64::AUTIA1716:
- case AArch64::AUTIASP:
- case AArch64::AUTIAZ:
- case AArch64::AUTIB:
- case AArch64::AUTIB1716:
- case AArch64::AUTIBSP:
- case AArch64::AUTIBZ:
- case AArch64::AUTIZA:
- case AArch64::AUTIZB:
- return true;
- }
-}
-
-bool isLoadTagMultiple(unsigned Opcode) {
- switch (Opcode) {
- default:
- return false;
-
- // Load tag multiple instruction
- case AArch64::LDGM:
- return true;
- }
-}
-
static unsigned getLoadImmediateOpcode(unsigned RegBitWidth) {
switch (RegBitWidth) {
case 32:
@@ -198,35 +151,6 @@ class ExegesisAArch64Target : public ExegesisTarget {
// Function return is a pseudo-instruction that needs to be expanded
PM.add(createAArch64ExpandPseudoPass());
}
-
- const char *getIgnoredOpcodeReasonOrNull(const LLVMState &State,
- unsigned Opcode) const override {
- if (const char *Reason =
- ExegesisTarget::getIgnoredOpcodeReasonOrNull(State, Opcode))
- return Reason;
-
- if (isPointerAuth(Opcode)) {
-#if defined(__aarch64__) && defined(__linux__)
- // Disable all PAC keys. Note that while we expect the measurements to
- // be the same with PAC keys disabled, they could potentially be lower
- // since authentication checks are bypassed.
- if (prctl(PR_PAC_SET_ENABLED_KEYS,
- PR_PAC_APIAKEY | PR_PAC_APIBKEY | PR_PAC_APDAKEY |
- PR_PAC_APDBKEY, // all keys
- 0, // disable all
- 0, 0) < 0) {
- return "Failed to disable PAC keys";
- }
-#else
- return "Unsupported opcode: isPointerAuth";
-#endif
- }
-
- if (isLoadTagMultiple(Opcode))
- return "Unsupported opcode: load tag multiple";
-
- return nullptr;
- }
};
} // namespace
|
|
Copying some folks from PR #136868 : This commit is still causing issues in |
|
Hi @tuliom , is the opcode test also crashing with the commit ? |
abhilash1910
reviewed
Jun 2, 2025
| @@ -12,12 +12,6 @@ | |||
| #if defined(__aarch64__) && defined(__linux__) | |||
| #include <linux/prctl.h> // For PR_PAC_* constants | |||
There was a problem hiding this comment.
Can you also remove this header due to #139443
There was a problem hiding this comment.
@abhilash1910 I believe that would require to also revert 36850a0 and 5dc3cd0 because they depend on this header.
There was a problem hiding this comment.
I think this header is duplicated in sys/prctl.h ; but sure we can keep it and remove safely in my PR. Thanks
Yes, it is. However it doesn't give too much information. |
tstellar
approved these changes
Jun 2, 2025
sallto
pushed a commit
to sallto/llvm-project
that referenced
this pull request
Jun 3, 2025
…d instructions fixed (llvm#136868)" (llvm#142382) This reverts commit 475531b. But it does not revert the changes from commits 36850a0 and 5dc3cd0.
lakshayk-nv
added a commit
to lakshayk-nv/llvm-project
that referenced
this pull request
Jun 3, 2025
rorth
pushed a commit
to rorth/llvm-project
that referenced
this pull request
Jun 11, 2025
…d instructions fixed (llvm#136868)" (llvm#142382) This reverts commit 475531b. But it does not revert the changes from commits 36850a0 and 5dc3cd0.
DhruvSrivastavaX
pushed a commit
to DhruvSrivastavaX/lldb-for-aix
that referenced
this pull request
Jun 12, 2025
…d instructions fixed (llvm#136868)" (llvm#142382) This reverts commit 475531b. But it does not revert the changes from commits 36850a0 and 5dc3cd0.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This reverts commit 475531b. But it does not revert the changes from commits
36850a0 and
5dc3cd0.