[clang] [FMV] Allow target version definitions in any order. (PR #83887)
Alexandros Lamprineas via cfe-commits
cfe-commits at lists.llvm.org
Tue Mar 5 06:52:25 PST 2024
https://github.com/labrinea updated https://github.com/llvm/llvm-project/pull/83887
>From f11c97d7f7f67edaf6de4390bcceb13dfea376a1 Mon Sep 17 00:00:00 2001
From: Alexandros Lamprineas <alexandros.lamprineas at arm.com>
Date: Mon, 4 Mar 2024 18:12:22 +0000
Subject: [PATCH] [FMV] Allow target version definitions in any order.
This patch fixes #71698. It allows defining the default target
version prior to other version definitions without raising
semantic errors.
---
clang/lib/Sema/SemaDecl.cpp | 15 +++++--
clang/test/CodeGen/attr-target-version.c | 56 ++++++++++++------------
clang/test/Sema/attr-target-version.c | 25 ++++++++---
3 files changed, 59 insertions(+), 37 deletions(-)
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 3ae78748a4e499..bd3235ea7efb92 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -11429,6 +11429,16 @@ static bool CheckTargetCausesMultiVersioning(Sema &S, FunctionDecl *OldFD,
bool &Redeclaration,
NamedDecl *&OldDecl,
LookupResult &Previous) {
+ assert(!OldFD->isMultiVersion() && "Unexpected MultiVersion");
+
+ // The definitions should be allowed in any order. If we have discovered
+ // a new target version and the preceeding was the default, then add the
+ // corresponding attribute to it.
+ if (OldFD->getMultiVersionKind() == MultiVersionKind::None &&
+ NewFD->getMultiVersionKind() == MultiVersionKind::TargetVersion)
+ OldFD->addAttr(TargetVersionAttr::CreateImplicit(S.Context, "default",
+ OldFD->getSourceRange()));
+
const auto *NewTA = NewFD->getAttr<TargetAttr>();
const auto *NewTVA = NewFD->getAttr<TargetVersionAttr>();
const auto *OldTA = OldFD->getAttr<TargetAttr>();
@@ -11455,9 +11465,8 @@ static bool CheckTargetCausesMultiVersioning(Sema &S, FunctionDecl *OldFD,
}
// If this is 'default', permit the forward declaration.
- if (!OldFD->isMultiVersion() &&
- ((NewTA && NewTA->isDefaultVersion() && !OldTA) ||
- (NewTVA && NewTVA->isDefaultVersion() && !OldTVA))) {
+ if ((NewTA && NewTA->isDefaultVersion() && !OldTA) ||
+ (NewTVA && NewTVA->isDefaultVersion() && !OldTVA)) {
Redeclaration = true;
OldDecl = OldFD;
OldFD->setIsMultiVersion();
diff --git a/clang/test/CodeGen/attr-target-version.c b/clang/test/CodeGen/attr-target-version.c
index 56a42499d0a7ca..ae1a8772f6cc07 100644
--- a/clang/test/CodeGen/attr-target-version.c
+++ b/clang/test/CodeGen/attr-target-version.c
@@ -94,16 +94,16 @@ int hoo(void) {
// CHECK: @fmv_one.ifunc = weak_odr alias i32 (), ptr @fmv_one
// CHECK: @fmv_two.ifunc = weak_odr alias i32 (), ptr @fmv_two
// CHECK: @fmv_e.ifunc = weak_odr alias i32 (), ptr @fmv_e
+// CHECK: @fmv_c.ifunc = weak_odr alias void (), ptr @fmv_c
// CHECK: @fmv_inline.ifunc = weak_odr alias i32 (), ptr @fmv_inline
// CHECK: @fmv_d.ifunc = internal alias i32 (), ptr @fmv_d
-// CHECK: @fmv_c.ifunc = weak_odr alias void (), ptr @fmv_c
// CHECK: @fmv = weak_odr ifunc i32 (), ptr @fmv.resolver
// CHECK: @fmv_one = weak_odr ifunc i32 (), ptr @fmv_one.resolver
// CHECK: @fmv_two = weak_odr ifunc i32 (), ptr @fmv_two.resolver
// CHECK: @fmv_e = weak_odr ifunc i32 (), ptr @fmv_e.resolver
+// CHECK: @fmv_c = weak_odr ifunc void (), ptr @fmv_c.resolver
// CHECK: @fmv_inline = weak_odr ifunc i32 (), ptr @fmv_inline.resolver
// CHECK: @fmv_d = internal ifunc i32 (), ptr @fmv_d.resolver
-// CHECK: @fmv_c = weak_odr ifunc void (), ptr @fmv_c.resolver
//.
// CHECK: Function Attrs: noinline nounwind optnone
// CHECK-LABEL: define {{[^@]+}}@fmv._MflagmMfp16fmlMrng
@@ -238,11 +238,18 @@ int hoo(void) {
// CHECK-NEXT: ret i32 111
//
//
-// CHECK: Function Attrs: noinline nounwind optnone
-// CHECK-LABEL: define {{[^@]+}}@fmv_c._Mssbs
-// CHECK-SAME: () #[[ATTR2]] {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: ret void
+// CHECK-LABEL: define {{[^@]+}}@fmv_c.resolver() comdat {
+// CHECK-NEXT: resolver_entry:
+// CHECK-NEXT: call void @__init_cpu_features_resolver()
+// CHECK-NEXT: [[TMP0:%.*]] = load i64, ptr @__aarch64_cpu_features, align 8
+// CHECK-NEXT: [[TMP1:%.*]] = and i64 [[TMP0]], 281474976710656
+// CHECK-NEXT: [[TMP2:%.*]] = icmp eq i64 [[TMP1]], 281474976710656
+// CHECK-NEXT: [[TMP3:%.*]] = and i1 true, [[TMP2]]
+// CHECK-NEXT: br i1 [[TMP3]], label [[RESOLVER_RETURN:%.*]], label [[RESOLVER_ELSE:%.*]]
+// CHECK: resolver_return:
+// CHECK-NEXT: ret ptr @fmv_c._Mssbs
+// CHECK: resolver_else:
+// CHECK-NEXT: ret ptr @fmv_c.default
//
//
// CHECK: Function Attrs: noinline nounwind optnone
@@ -405,20 +412,6 @@ int hoo(void) {
// CHECK-NEXT: ret ptr @fmv_d.default
//
//
-// CHECK-LABEL: define {{[^@]+}}@fmv_c.resolver() comdat {
-// CHECK-NEXT: resolver_entry:
-// CHECK-NEXT: call void @__init_cpu_features_resolver()
-// CHECK-NEXT: [[TMP0:%.*]] = load i64, ptr @__aarch64_cpu_features, align 8
-// CHECK-NEXT: [[TMP1:%.*]] = and i64 [[TMP0]], 281474976710656
-// CHECK-NEXT: [[TMP2:%.*]] = icmp eq i64 [[TMP1]], 281474976710656
-// CHECK-NEXT: [[TMP3:%.*]] = and i1 true, [[TMP2]]
-// CHECK-NEXT: br i1 [[TMP3]], label [[RESOLVER_RETURN:%.*]], label [[RESOLVER_ELSE:%.*]]
-// CHECK: resolver_return:
-// CHECK-NEXT: ret ptr @fmv_c._Mssbs
-// CHECK: resolver_else:
-// CHECK-NEXT: ret ptr @fmv_c.default
-//
-//
// CHECK: Function Attrs: noinline nounwind optnone
// CHECK-LABEL: define {{[^@]+}}@recur
// CHECK-SAME: () #[[ATTR2]] {
@@ -568,6 +561,20 @@ int hoo(void) {
//
//
// CHECK: Function Attrs: noinline nounwind optnone
+// CHECK-LABEL: define {{[^@]+}}@fmv_c.default
+// CHECK-SAME: () #[[ATTR2]] {
+// CHECK-NEXT: entry:
+// CHECK-NEXT: ret void
+//
+//
+// CHECK: Function Attrs: noinline nounwind optnone
+// CHECK-LABEL: define {{[^@]+}}@fmv_c._Mssbs
+// CHECK-SAME: () #[[ATTR2]] {
+// CHECK-NEXT: entry:
+// CHECK-NEXT: ret void
+//
+//
+// CHECK: Function Attrs: noinline nounwind optnone
// CHECK-LABEL: define {{[^@]+}}@fmv_inline._Mf64mmMpmullMsha1
// CHECK-SAME: () #[[ATTR12:[0-9]+]] {
// CHECK-NEXT: entry:
@@ -700,13 +707,6 @@ int hoo(void) {
// CHECK-NEXT: ret i32 1
//
//
-// CHECK: Function Attrs: noinline nounwind optnone
-// CHECK-LABEL: define {{[^@]+}}@fmv_c.default
-// CHECK-SAME: () #[[ATTR2]] {
-// CHECK-NEXT: entry:
-// CHECK-NEXT: ret void
-//
-//
// CHECK-NOFMV: Function Attrs: noinline nounwind optnone
// CHECK-NOFMV-LABEL: define {{[^@]+}}@fmv
// CHECK-NOFMV-SAME: () #[[ATTR0:[0-9]+]] {
diff --git a/clang/test/Sema/attr-target-version.c b/clang/test/Sema/attr-target-version.c
index 587c721de5e322..e2940c434c2ff5 100644
--- a/clang/test/Sema/attr-target-version.c
+++ b/clang/test/Sema/attr-target-version.c
@@ -42,12 +42,25 @@ void __attribute__((target_version("ssbs+fp16fml"))) two(void) {}
//expected-error at +1 {{'main' cannot be a multiversioned function}}
int __attribute__((target_version("lse"))) main(void) { return 1; }
-//expected-note at +1 {{previous definition is here}}
-int hoo(void) { return 1; }
-//expected-note at -1 {{previous definition is here}}
-//expected-warning at +2 {{attribute declaration must precede definition}}
-//expected-error at +1 {{redefinition of 'hoo'}}
-int __attribute__((target_version("dit"))) hoo(void) { return 2; }
+// It is ok for the default version to appear first.
+int default_first(void) { return 1; }
+int __attribute__((target_version("dit"))) default_first(void) { return 2; }
+int __attribute__((target_version("mops"))) default_first(void) { return 3; }
+
+// It is ok if the default version is between other versions.
+int __attribute__((target_version("simd"))) default_middle(void) {return 0; }
+int __attribute__((target_version("default"))) default_middle(void) { return 1; }
+int __attribute__((target_version("aes"))) default_middle(void) { return 2; }
+
+// It is ok for the default version to be the last one.
+int __attribute__((target_version("rdm"))) default_last(void) {return 0; }
+int __attribute__((target_version("lse+aes"))) default_last(void) { return 1; }
+int __attribute__((target_version("default"))) default_last(void) { return 2; }
+
+// It is also ok to forward declare the default.
+int __attribute__((target_version("default"))) default_fwd_declare(void);
+int __attribute__((target_version("sve"))) default_fwd_declare(void) { return 0; }
+int default_fwd_declare(void) { return 1; }
//expected-warning at +1 {{unsupported '' in the 'target_version' attribute string; 'target_version' attribute ignored}}
int __attribute__((target_version(""))) unsup1(void) { return 1; }
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