diff options
| author | Nate Begeman <natebegeman@mac.com> | 2010-12-10 00:26:57 +0000 |
|---|---|---|
| committer | Nate Begeman <natebegeman@mac.com> | 2010-12-10 00:26:57 +0000 |
| commit | 2ea8ee7c76b8d8754d81072e691caf25d23289e3 (patch) | |
| tree | b3d1820d852b71777b8db8f87672b044555d6e5c /lib/Target/X86/X86Subtarget.cpp | |
| parent | 1c952b9cc98e84b28f68f0f6cf11197263f89863 (diff) | |
Formalize the notion that AVX and SSE are non-overlapping extensions from the compiler's point of view. Per email discussion, we either want to always use VEX-prefixed instructions or never use them, and are taking "HasAVX" to mean "Always use VEX". Passing -mattr=-avx,+sse42 should serve to restore legacy SSE support when desirable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121439 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86Subtarget.cpp')
| -rw-r--r-- | lib/Target/X86/X86Subtarget.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp index 5607c133bc..c251984dcc 100644 --- a/lib/Target/X86/X86Subtarget.cpp +++ b/lib/Target/X86/X86Subtarget.cpp @@ -256,13 +256,13 @@ void X86Subtarget::AutoDetectSubtargetFeatures() { if ((ECX >> 9) & 1) X86SSELevel = SSSE3; if ((ECX >> 19) & 1) X86SSELevel = SSE41; if ((ECX >> 20) & 1) X86SSELevel = SSE42; + if ((ECX >> 28) & 1) { HasAVX = true; X86SSELevel = NoMMXSSE; } bool IsIntel = memcmp(text.c, "GenuineIntel", 12) == 0; bool IsAMD = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0; HasCLMUL = IsIntel && ((ECX >> 1) & 0x1); HasFMA3 = IsIntel && ((ECX >> 12) & 0x1); - HasAVX = ((ECX >> 28) & 0x1); HasAES = IsIntel && ((ECX >> 25) & 0x1); if (IsIntel || IsAMD) { @@ -316,11 +316,13 @@ X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS, ParseSubtargetFeatures(FS, CPU); // All X86-64 CPUs also have SSE2, however user might request no SSE via // -mattr, so don't force SSELevel here. + if (HasAVX) + X86SSELevel = NoMMXSSE; } else { // Otherwise, use CPUID to auto-detect feature set. AutoDetectSubtargetFeatures(); // Make sure SSE2 is enabled; it is available on all X86-64 CPUs. - if (Is64Bit && X86SSELevel < SSE2) + if (Is64Bit && !HasAVX && X86SSELevel < SSE2) X86SSELevel = SSE2; } |