https://github.com/isakhilesh created
https://github.com/llvm/llvm-project/pull/135404
While `FoldingImmLike` accepts `MO_Immediate`, `MO_FrameIndex` and
`MO_GlobalAddress`, the conditional block after it only covers the first 2, so
I have added a case for the global value as well.
>From 116e14cfa6274b00da641be60f8db7444588b990 Mon Sep 17 00:00:00 2001
From: Malavika Samak
Date: Thu, 10 Apr 2025 11:00:02 -0700
Subject: [PATCH] Case handling MachineOperandType address of a global value in
SIFoldOperands
While `FoldingImmLike` accepts `MO_Immediate`, `MO_FrameIndex` and
`MO_GlobalAddress`, the conditional block after it only covers the first 2, so
I have added a case for the global value as well.
---
clang/include/clang/Basic/AttrDocs.td | 8 +---
llvm/lib/Target/AMDGPU/SIFoldOperands.cpp | 4 +++-
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/clang/include/clang/Basic/AttrDocs.td
b/clang/include/clang/Basic/AttrDocs.td
index c8b371280e35d..97a5f24d35d7d 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -7517,9 +7517,11 @@ the field it is attached to, and it may also lead to
emission of automatic fix-i
hints which would help the user replace the use of unsafe functions(/fields)
with safe
alternatives, though the attribute can be used even when the fix can't be
automated.
-* Attribute attached to functions: The attribute does not suppress
- ``-Wunsafe-buffer-usage`` inside the function to which it is attached.
- These warnings still need to be addressed.
+* Attribute attached to functions: The attribute suppresses all
+ ``-Wunsafe-buffer-usage`` warnings within the function it is attached to, as
the
+ function is now classified as unsafe. The attribute should be used
carefully, as it
+ will silence all unsafe operation warnings inside the function; including
any new
+ unsafe operations introduced in the future.
The attribute is warranted even if the only way a function can overflow
the buffer is by violating the function's preconditions. For example, it
diff --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
index d6acf9e081b9f..701d17930d7df 100644
--- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -1161,8 +1161,10 @@ void SIFoldOperandsImpl::foldOperand(
if (OpToFold.isImm())
UseMI->getOperand(1).ChangeToImmediate(OpToFold.getImm());
-else
+else if(OpToFold.isFI())
UseMI->getOperand(1).ChangeToFrameIndex(OpToFold.getIndex());
+else if(OpToFold.isGlobal())
+ return;
UseMI->removeOperand(2); // Remove exec read (or src1 for readlane)
return;
}
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