def Feature3DNowA : SubtargetFeature<"3dnowa", "X863DNowLevel", "ThreeDNowA",
"Enable 3DNow! Athlon instructions",
[Feature3DNow]>;
+// All x86-64 hardware has SSE2, but we don't mark SSE2 as an implied
+// feature, because SSE2 can be disabled (e.g. for compiling OS kernels)
+// without disabling 64-bit mode.
def Feature64Bit : SubtargetFeature<"64bit", "HasX86_64", "true",
- "Support 64-bit instructions",
- [FeatureSSE2]>;
+ "Support 64-bit instructions">;
def FeatureSlowBTMem : SubtargetFeature<"slow-bt-mem", "IsBTMemSlow", "true",
"Bit testing of memory is slow">;
def : Proc<"pentium3", [FeatureSSE1]>;
def : Proc<"pentium-m", [FeatureSSE2, FeatureSlowBTMem]>;
def : Proc<"pentium4", [FeatureSSE2]>;
-def : Proc<"x86-64", [Feature64Bit, FeatureSlowBTMem]>;
+def : Proc<"x86-64", [FeatureSSE2, Feature64Bit, FeatureSlowBTMem]>;
def : Proc<"yonah", [FeatureSSE3, FeatureSlowBTMem]>;
def : Proc<"prescott", [FeatureSSE3, FeatureSlowBTMem]>;
def : Proc<"nocona", [FeatureSSE3, Feature64Bit, FeatureSlowBTMem]>;
def : Proc<"athlon-4", [FeatureSSE1, Feature3DNowA, FeatureSlowBTMem]>;
def : Proc<"athlon-xp", [FeatureSSE1, Feature3DNowA, FeatureSlowBTMem]>;
def : Proc<"athlon-mp", [FeatureSSE1, Feature3DNowA, FeatureSlowBTMem]>;
-def : Proc<"k8", [Feature3DNowA, Feature64Bit, FeatureSlowBTMem]>;
-def : Proc<"opteron", [Feature3DNowA, Feature64Bit, FeatureSlowBTMem]>;
-def : Proc<"athlon64", [Feature3DNowA, Feature64Bit, FeatureSlowBTMem]>;
-def : Proc<"athlon-fx", [Feature3DNowA, Feature64Bit, FeatureSlowBTMem]>;
+def : Proc<"k8", [FeatureSSE2, Feature3DNowA, Feature64Bit,
+ FeatureSlowBTMem]>;
+def : Proc<"opteron", [FeatureSSE2, Feature3DNowA, Feature64Bit,
+ FeatureSlowBTMem]>;
+def : Proc<"athlon64", [FeatureSSE2, Feature3DNowA, Feature64Bit,
+ FeatureSlowBTMem]>;
+def : Proc<"athlon-fx", [FeatureSSE2, Feature3DNowA, Feature64Bit,
+ FeatureSlowBTMem]>;
def : Proc<"winchip-c6", [FeatureMMX]>;
def : Proc<"winchip2", [FeatureMMX, Feature3DNow]>;
} else {
// Otherwise, use CPUID to auto-detect feature set.
AutoDetectSubtargetFeatures();
- if (Is64Bit && X86SSELevel < SSE2) {
- // Make sure SSE2 is enabled, it is available on all X86-64 CPUs.
- X86SSELevel = SSE2;
- }
- }
-
- // If requesting codegen for X86-64, make sure that 64-bit features
- // are enabled.
- if (Is64Bit) {
+ // If requesting codegen for X86-64, make sure that 64-bit features
+ // are enabled.
+ if (Is64Bit)
HasX86_64 = true;
+ // Make sure SSE2 is enabled; it is available on all X86-64 CPUs.
+ if (Is64Bit && X86SSELevel < SSE2)
+ X86SSELevel = SSE2;
}
- assert(!Is64Bit || HasX86_64);
+
DOUT << "Subtarget features: SSELevel " << X86SSELevel
<< ", 3DNowLevel " << X863DNowLevel
<< ", 64bit " << HasX86_64 << "\n";
+ assert((!Is64Bit || HasX86_64) &&
+ "64-bit code requested on a subtarget that doesn't support it!");
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.