[PATCH] D110681: [X86][ISel] Lowering llvm.thread.pointer
Freddy, Ye via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Oct 8 07:32:12 PDT 2021
FreddyYe updated this revision to Diff 378209.
FreddyYe marked 3 inline comments as done.
FreddyYe added a comment.
Address comments.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D110681/new/
https://reviews.llvm.org/D110681
Files:
llvm/lib/Target/X86/X86ISelLowering.cpp
llvm/test/CodeGen/X86/thread_pointer.ll
Index: llvm/test/CodeGen/X86/thread_pointer.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/X86/thread_pointer.ll
@@ -0,0 +1,51 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck %s --check-prefix=X64
+; RUN: llc < %s -mtriple=x86_64-linux-gnux32 | FileCheck %s --check-prefix=X32
+; RUN: llc < %s -mtriple=i386-linux-gnu | FileCheck %s --check-prefix=X86
+
+declare i8* @llvm.thread.pointer()
+
+define i8* @thread_pointer() nounwind {
+; X64-LABEL: thread_pointer:
+; X64: # %bb.0:
+; X64-NEXT: movq %fs:0, %rax
+; X64-NEXT: retq
+;
+; X32-LABEL: thread_pointer:
+; X32: # %bb.0:
+; X32-NEXT: movl %fs:0, %eax
+; X32-NEXT: retq
+;
+; X86-LABEL: thread_pointer:
+; X86: # %bb.0:
+; X86-NEXT: movl %gs:0, %eax
+; X86-NEXT: retl
+ %1 = tail call i8* @llvm.thread.pointer()
+ ret i8* %1
+}
+
+define i32 @thread_pointer2(i32 %i) nounwind {
+; X64-LABEL: thread_pointer2:
+; X64: # %bb.0: # %entry
+; X64-NEXT: movslq %edi, %rax
+; X64-NEXT: movl %fs:(,%rax,4), %eax
+; X64-NEXT: retq
+;
+; X32-LABEL: thread_pointer2:
+; X32: # %bb.0: # %entry
+; X32-NEXT: movl %fs:0, %eax
+; X32-NEXT: movl (%eax,%edi,4), %eax
+; X32-NEXT: retq
+;
+; X86-LABEL: thread_pointer2:
+; X86: # %bb.0: # %entry
+; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT: movl %gs:(,%eax,4), %eax
+; X86-NEXT: retl
+entry:
+ %0 = tail call i8* @llvm.thread.pointer()
+ %1 = bitcast i8* %0 to i32*
+ %arrayidx = getelementptr inbounds i32, i32* %1, i32 %i
+ %2 = load i32, i32* %arrayidx, align 4
+ ret i32 %2
+}
Index: llvm/lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- llvm/lib/Target/X86/X86ISelLowering.cpp
+++ llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -26715,6 +26715,18 @@
getPointerTy(DAG.getDataLayout())),
Op.getOperand(1), ShAmt);
}
+ case Intrinsic::thread_pointer: {
+ if (Subtarget.isTargetELF()) {
+ SDLoc dl(Op);
+ EVT PtrVT = getPointerTy(DAG.getDataLayout());
+ // Get the Thread Pointer, which is %gs:0 (32-bit) or %fs:0 (64-bit).
+ Value *Ptr = Constant::getNullValue(Type::getInt8PtrTy(
+ *DAG.getContext(), Subtarget.is64Bit() ? X86AS::FS : X86AS::GS));
+ return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
+ DAG.getIntPtrConstant(0, dl), MachinePointerInfo(Ptr));
+ }
+ report_fatal_error("Target OS doesn't support __builtin_thread_pointer() yet.");
+ }
}
}
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