Author: dim Date: Sat Feb 17 13:04:35 2018 New Revision: 325446 URL: http://llvm.org/viewvc/llvm-project?rev=325446&view=rev Log: [X86] Add 'sahf' CPU feature to frontend
Summary: Make clang accept `-msahf` (and `-mno-sahf`) flags to activate the `+sahf` feature for the backend, for bug 36028 (Incorrect use of pushf/popf enables/disables interrupts on amd64 kernels). This was originally submitted in bug 36037 by Jonathan Looney <jonloo...@gmail.com>. As described there, GCC also uses `-msahf` for this feature, and the backend already recognizes the `+sahf` feature. All that is needed is to teach clang to pass this on to the backend. The mapping of feature support onto CPUs may not be complete; rather, it was chosen to match LLVM's idea of which CPUs support this feature (see lib/Target/X86/X86.td). I also updated the affected test case (CodeGen/attr-target-x86.c) to match the emitted output. Reviewers: craig.topper, coby, efriedma, rsmith Reviewed By: craig.topper Subscribers: emaste, cfe-commits Differential Revision: https://reviews.llvm.org/D43394 Modified: cfe/trunk/include/clang/Driver/Options.td cfe/trunk/lib/Basic/Targets/X86.cpp cfe/trunk/lib/Basic/Targets/X86.h cfe/trunk/test/CodeGen/attr-target-x86.c Modified: cfe/trunk/include/clang/Driver/Options.td URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.td?rev=325446&r1=325445&r2=325446&view=diff ============================================================================== --- cfe/trunk/include/clang/Driver/Options.td (original) +++ cfe/trunk/include/clang/Driver/Options.td Sat Feb 17 13:04:35 2018 @@ -2591,6 +2591,8 @@ def mrtm : Flag<["-"], "mrtm">, Group<m_ def mno_rtm : Flag<["-"], "mno-rtm">, Group<m_x86_Features_Group>; def mrdseed : Flag<["-"], "mrdseed">, Group<m_x86_Features_Group>; def mno_rdseed : Flag<["-"], "mno-rdseed">, Group<m_x86_Features_Group>; +def msahf : Flag<["-"], "msahf">, Group<m_x86_Features_Group>; +def mno_sahf : Flag<["-"], "mno-sahf">, Group<m_x86_Features_Group>; def msgx : Flag<["-"], "msgx">, Group<m_x86_Features_Group>; def mno_sgx : Flag<["-"], "mno-sgx">, Group<m_x86_Features_Group>; def msha : Flag<["-"], "msha">, Group<m_x86_Features_Group>; Modified: cfe/trunk/lib/Basic/Targets/X86.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets/X86.cpp?rev=325446&r1=325445&r2=325446&view=diff ============================================================================== --- cfe/trunk/lib/Basic/Targets/X86.cpp (original) +++ cfe/trunk/lib/Basic/Targets/X86.cpp Sat Feb 17 13:04:35 2018 @@ -220,6 +220,7 @@ bool X86TargetInfo::initFeatureMap( LLVM_FALLTHROUGH; case CK_Core2: setFeatureEnabledImpl(Features, "ssse3", true); + setFeatureEnabledImpl(Features, "sahf", true); LLVM_FALLTHROUGH; case CK_Yonah: case CK_Prescott: @@ -261,6 +262,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "ssse3", true); setFeatureEnabledImpl(Features, "fxsr", true); setFeatureEnabledImpl(Features, "cx16", true); + setFeatureEnabledImpl(Features, "sahf", true); break; case CK_KNM: @@ -291,6 +293,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "xsaveopt", true); setFeatureEnabledImpl(Features, "xsave", true); setFeatureEnabledImpl(Features, "movbe", true); + setFeatureEnabledImpl(Features, "sahf", true); break; case CK_K6_2: @@ -304,6 +307,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "sse4a", true); setFeatureEnabledImpl(Features, "lzcnt", true); setFeatureEnabledImpl(Features, "popcnt", true); + setFeatureEnabledImpl(Features, "sahf", true); LLVM_FALLTHROUGH; case CK_K8SSE3: setFeatureEnabledImpl(Features, "sse3", true); @@ -337,6 +341,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "prfchw", true); setFeatureEnabledImpl(Features, "cx16", true); setFeatureEnabledImpl(Features, "fxsr", true); + setFeatureEnabledImpl(Features, "sahf", true); break; case CK_ZNVER1: @@ -360,6 +365,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "prfchw", true); setFeatureEnabledImpl(Features, "rdrnd", true); setFeatureEnabledImpl(Features, "rdseed", true); + setFeatureEnabledImpl(Features, "sahf", true); setFeatureEnabledImpl(Features, "sha", true); setFeatureEnabledImpl(Features, "sse4a", true); setFeatureEnabledImpl(Features, "xsave", true); @@ -394,6 +400,7 @@ bool X86TargetInfo::initFeatureMap( setFeatureEnabledImpl(Features, "cx16", true); setFeatureEnabledImpl(Features, "fxsr", true); setFeatureEnabledImpl(Features, "xsave", true); + setFeatureEnabledImpl(Features, "sahf", true); break; } if (!TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec)) @@ -792,6 +799,8 @@ bool X86TargetInfo::handleTargetFeatures HasRetpoline = true; } else if (Feature == "+retpoline-external-thunk") { HasRetpolineExternalThunk = true; + } else if (Feature == "+sahf") { + HasLAHFSAHF = true; } X86SSEEnum Level = llvm::StringSwitch<X86SSEEnum>(Feature) @@ -1269,6 +1278,7 @@ bool X86TargetInfo::isValidFeatureName(S .Case("rdrnd", true) .Case("rdseed", true) .Case("rtm", true) + .Case("sahf", true) .Case("sgx", true) .Case("sha", true) .Case("shstk", true) @@ -1343,6 +1353,7 @@ bool X86TargetInfo::hasFeature(StringRef .Case("retpoline", HasRetpoline) .Case("retpoline-external-thunk", HasRetpolineExternalThunk) .Case("rtm", HasRTM) + .Case("sahf", HasLAHFSAHF) .Case("sgx", HasSGX) .Case("sha", HasSHA) .Case("shstk", HasSHSTK) Modified: cfe/trunk/lib/Basic/Targets/X86.h URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets/X86.h?rev=325446&r1=325445&r2=325446&view=diff ============================================================================== --- cfe/trunk/lib/Basic/Targets/X86.h (original) +++ cfe/trunk/lib/Basic/Targets/X86.h Sat Feb 17 13:04:35 2018 @@ -99,6 +99,7 @@ class LLVM_LIBRARY_VISIBILITY X86TargetI bool HasRDPID = false; bool HasRetpoline = false; bool HasRetpolineExternalThunk = false; + bool HasLAHFSAHF = false; protected: /// \brief Enumeration of all of the X86 CPUs supported by Clang. Modified: cfe/trunk/test/CodeGen/attr-target-x86.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/attr-target-x86.c?rev=325446&r1=325445&r2=325446&view=diff ============================================================================== --- cfe/trunk/test/CodeGen/attr-target-x86.c (original) +++ cfe/trunk/test/CodeGen/attr-target-x86.c Sat Feb 17 13:04:35 2018 @@ -49,10 +49,10 @@ int __attribute__((target("arch=lakemont // CHECK: lake{{.*}} #7 // CHECK: use_before_def{{.*}} #7 // CHECK: #0 = {{.*}}"target-cpu"="i686" "target-features"="+x87" -// CHECK: #1 = {{.*}}"target-cpu"="ivybridge" "target-features"="+aes,+avx,+cx16,+f16c,+fsgsbase,+fxsr,+mmx,+pclmul,+popcnt,+rdrnd,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt" +// CHECK: #1 = {{.*}}"target-cpu"="ivybridge" "target-features"="+aes,+avx,+cx16,+f16c,+fsgsbase,+fxsr,+mmx,+pclmul,+popcnt,+rdrnd,+sahf,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt" // CHECK: #2 = {{.*}}"target-cpu"="i686" "target-features"="+x87,-aes,-avx,-avx2,-avx512bitalg,-avx512bw,-avx512cd,-avx512dq,-avx512er,-avx512f,-avx512ifma,-avx512pf,-avx512vbmi,-avx512vbmi2,-avx512vl,-avx512vnni,-avx512vpopcntdq,-f16c,-fma,-fma4,-gfni,-pclmul,-sha,-sse2,-sse3,-sse4.1,-sse4.2,-sse4a,-ssse3,-vaes,-vpclmulqdq,-xop,-xsave,-xsaveopt" // CHECK: #3 = {{.*}}"target-cpu"="i686" "target-features"="+mmx,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87" // CHECK: #4 = {{.*}}"target-cpu"="i686" "target-features"="+x87,-avx,-avx2,-avx512bitalg,-avx512bw,-avx512cd,-avx512dq,-avx512er,-avx512f,-avx512ifma,-avx512pf,-avx512vbmi,-avx512vbmi2,-avx512vl,-avx512vnni,-avx512vpopcntdq,-f16c,-fma,-fma4,-sse4.1,-sse4.2,-vaes,-vpclmulqdq,-xop,-xsave,-xsaveopt" -// CHECK: #5 = {{.*}}"target-cpu"="ivybridge" "target-features"="+avx,+cx16,+f16c,+fsgsbase,+fxsr,+mmx,+pclmul,+popcnt,+rdrnd,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt,-aes,-vaes" +// CHECK: #5 = {{.*}}"target-cpu"="ivybridge" "target-features"="+avx,+cx16,+f16c,+fsgsbase,+fxsr,+mmx,+pclmul,+popcnt,+rdrnd,+sahf,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave,+xsaveopt,-aes,-vaes" // CHECK: #6 = {{.*}}"target-cpu"="i686" "target-features"="+x87,-3dnow,-3dnowa,-mmx" // CHECK: #7 = {{.*}}"target-cpu"="lakemont" "target-features"="+mmx" _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
