[clang] [X86] Emit Warnings for frontend options to enable knl/knm. (PR #75580)
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Fri Dec 15 01:25:58 PST 2023
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Freddy Ye (FreddyLeaf)
<details>
<summary>Changes</summary>
Since Knight Landing and Knight Mill microarchitectures are EOL, we
would like to remove its support in LLVM 19. In LLVM 18, we will first
emit a warning for the usage.
---
Full diff: https://github.com/llvm/llvm-project/pull/75580.diff
7 Files Affected:
- (modified) clang/include/clang/Basic/DiagnosticCommonKinds.td (+2)
- (modified) clang/lib/Basic/Targets/X86.cpp (+3)
- (modified) clang/test/CodeGen/X86/avx512er-builtins.c (+1-1)
- (modified) clang/test/CodeGen/X86/avx512pf-builtins.c (+1-1)
- (modified) clang/test/Driver/cl-x86-flags.c (+8-2)
- (modified) clang/test/Frontend/x86-target-cpu.c (+8-2)
- (modified) clang/test/Misc/warning-flags.c (+2-1)
``````````diff
diff --git a/clang/include/clang/Basic/DiagnosticCommonKinds.td b/clang/include/clang/Basic/DiagnosticCommonKinds.td
index 65a33f61a6948a..40841e9df547bc 100644
--- a/clang/include/clang/Basic/DiagnosticCommonKinds.td
+++ b/clang/include/clang/Basic/DiagnosticCommonKinds.td
@@ -349,6 +349,8 @@ def warn_invalid_feature_combination : Warning<
def warn_target_unrecognized_env : Warning<
"mismatch between architecture and environment in target triple '%0'; did you mean '%1'?">,
InGroup<InvalidCommandLineArgument>;
+def warn_knl_knm_target_supports_remove : Warning<
+ "KNL/KNM's feature support will be removed in LLVM 19.">;
// Source manager
def err_cannot_open_file : Error<"cannot open file '%0': %1">, DefaultFatal;
diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index b97f88647fa49f..dc56524d378104 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -295,11 +295,13 @@ bool X86TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
HasAVX512BF16 = true;
} else if (Feature == "+avx512er") {
HasAVX512ER = true;
+ Diags.Report(diag::warn_knl_knm_target_supports_remove);
} else if (Feature == "+avx512fp16") {
HasAVX512FP16 = true;
HasLegalHalfType = true;
} else if (Feature == "+avx512pf") {
HasAVX512PF = true;
+ Diags.Report(diag::warn_knl_knm_target_supports_remove);
} else if (Feature == "+avx512dq") {
HasAVX512DQ = true;
} else if (Feature == "+avx512bitalg") {
@@ -358,6 +360,7 @@ bool X86TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
HasPREFETCHI = true;
} else if (Feature == "+prefetchwt1") {
HasPREFETCHWT1 = true;
+ Diags.Report(diag::warn_knl_knm_target_supports_remove);
} else if (Feature == "+clzero") {
HasCLZERO = true;
} else if (Feature == "+cldemote") {
diff --git a/clang/test/CodeGen/X86/avx512er-builtins.c b/clang/test/CodeGen/X86/avx512er-builtins.c
index ee31236a3c01aa..11ec6aabec1e3f 100644
--- a/clang/test/CodeGen/X86/avx512er-builtins.c
+++ b/clang/test/CodeGen/X86/avx512er-builtins.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -flax-vector-conversions=none -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +avx512f -target-feature +avx512er -emit-llvm -o - -Wall -Werror | FileCheck %s
+// RUN: %clang_cc1 -flax-vector-conversions=none -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +avx512f -target-feature +avx512er -emit-llvm -o - -Wall | FileCheck %s
#include <immintrin.h>
diff --git a/clang/test/CodeGen/X86/avx512pf-builtins.c b/clang/test/CodeGen/X86/avx512pf-builtins.c
index 4ca70f5787968b..3a117ed6a9460e 100644
--- a/clang/test/CodeGen/X86/avx512pf-builtins.c
+++ b/clang/test/CodeGen/X86/avx512pf-builtins.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -flax-vector-conversions=none -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +avx512pf -emit-llvm -o - -Wall -Werror | FileCheck %s
+// RUN: %clang_cc1 -flax-vector-conversions=none -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +avx512pf -emit-llvm -o - -Wall | FileCheck %s
#include <immintrin.h>
diff --git a/clang/test/Driver/cl-x86-flags.c b/clang/test/Driver/cl-x86-flags.c
index 51b16f0ce35463..ae35a312fe8a4b 100644
--- a/clang/test/Driver/cl-x86-flags.c
+++ b/clang/test/Driver/cl-x86-flags.c
@@ -69,7 +69,10 @@
// RUN: %clang_cl -m32 -arch:avx2 --target=i386-pc-windows -### -- 2>&1 %s | FileCheck -check-prefix=avx2 %s
// avx2: invalid /arch: argument
-// RUN: %clang_cl -m32 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj -Xclang -verify -DTEST_32_ARCH_AVX512F -- %s
+// RUN: %clang_cl -m32 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj -Xclang -verify=KNL1 -DTEST_32_ARCH_AVX512F -- %s
+// KNL1-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// KNL1-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// KNL1-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
#if defined(TEST_32_ARCH_AVX512F)
#if _M_IX86_FP != 2 || !__AVX__ || !__AVX2__ || !__AVX512F__ || __AVX512BW__
#error fail
@@ -109,7 +112,10 @@
// RUN: %clang_cl -m64 -arch:avx2 --target=x86_64-pc-windows -### -- 2>&1 %s | FileCheck -check-prefix=avx264 %s
// avx264: invalid /arch: argument
-// RUN: %clang_cl -m64 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj -Xclang -verify -DTEST_64_ARCH_AVX512F -- %s
+// RUN: %clang_cl -m64 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj -Xclang -verify=KNL2 -DTEST_64_ARCH_AVX512F -- %s
+// KNL2-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// KNL2-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// KNL2-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
#if defined(TEST_64_ARCH_AVX512F)
#if _M_IX86_FP || !__AVX__ || !__AVX2__ || !__AVX512F__ || __AVX512BW__
#error fail
diff --git a/clang/test/Frontend/x86-target-cpu.c b/clang/test/Frontend/x86-target-cpu.c
index 6c8502ac2c21ee..be57b3c0ec583b 100644
--- a/clang/test/Frontend/x86-target-cpu.c
+++ b/clang/test/Frontend/x86-target-cpu.c
@@ -15,8 +15,14 @@
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu cannonlake -verify %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu icelake-client -verify %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu icelake-server -verify %s
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu knl -verify %s
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu knm -verify %s
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu knl -verify=knl %s
+// knl-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// knl-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// knl-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu knm -verify=knm %s
+// knm-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// knm-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
+// knm-warning@*:* {{KNL/KNM's feature support will be removed in LLVM 19.}}
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu bonnell -verify %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu silvermont -verify %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -target-cpu k8 -verify %s
diff --git a/clang/test/Misc/warning-flags.c b/clang/test/Misc/warning-flags.c
index c587337da5933a..f580445b1f10b9 100644
--- a/clang/test/Misc/warning-flags.c
+++ b/clang/test/Misc/warning-flags.c
@@ -18,7 +18,7 @@ This test serves two purposes:
The list of warnings below should NEVER grow. It should gradually shrink to 0.
-CHECK: Warnings without flags (65):
+CHECK: Warnings without flags (66):
CHECK-NEXT: ext_expected_semi_decl_list
CHECK-NEXT: ext_explicit_specialization_storage_class
@@ -56,6 +56,7 @@ CHECK-NEXT: warn_ignoring_ftabstop_value
CHECK-NEXT: warn_implements_nscopying
CHECK-NEXT: warn_incompatible_qualified_id
CHECK-NEXT: warn_invalid_asm_cast_lvalue
+CHECK-NEXT: warn_knl_knm_target_supports_remove
CHECK-NEXT: warn_maynot_respond
CHECK-NEXT: warn_method_param_redefinition
CHECK-NEXT: warn_missing_case_for_condition
``````````
</details>
https://github.com/llvm/llvm-project/pull/75580
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