[llvm] [asan][x86] Abort instrumenting memintrinsics that target fs, gs (PR #129291)

[Alexander Potapenko via llvm-commits]

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@@ -0,0 +1,60 @@
+; RUN: opt -passes=asan %s -S | FileCheck %s
+
+;; Punt AddressSanitizer::instrumentMemIntrinsics out for MemIntrinsics
+;; that need write to unsupported registers on X86
+;; PR124238: https://www.github.com/llvm/llvm-project/issues/124238
+
+target triple = "x86_64-unknown-linux-gnu"
+
+$.str.658906a285b7a0f82dabd9915e07848c = comdat any
+ at .str = internal constant { [2 x i8], [30 x i8] } { [2 x i8] c"x\00", [30 x i8] zeroinitializer }, comdat($.str.658906a285b7a0f82dabd9915e07848c), align 32
+ at 0 = private alias { [2 x i8], [30 x i8] }, ptr @.str
+
+define void @test_memcpy(i64 noundef %addr) sanitize_address #0 {
+entry:
+  %addr.addr = alloca i64, align 8
+  store i64 %addr, ptr %addr.addr, align 8
+  %0 = load i64, ptr %addr.addr, align 8
+  %1 = inttoptr i64 %0 to ptr addrspace(257)
+  call void @llvm.memcpy.p257.p0.i64(ptr addrspace(257) align 1 %1, ptr align 1 @.str, i64 1, i1 false)
+; CHECK: llvm.memcpy
+  %2 = load i64, ptr %addr.addr, align 8
+  %3 = inttoptr i64 %2 to ptr addrspace(256)
+  call void @llvm.memcpy.p256.p0.i64(ptr addrspace(256) align 1 %3, ptr align 1 @.str, i64 1, i1 false)
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ramosian-glider wrote:

My bad, should be `addrspace(258)`

https://github.com/llvm/llvm-project/pull/129291