[X86] Introduction of a new CPU Lakemont

[aturetsk]

Summary

Add a new CPU Lakemont which doesn't support X87.

[bruno]

Nice. LGTM

test/CodeGen/X86/lakemont-soft-fp.ll

2 ↗

(On Diff #52219)

The test can be renamed from lakemont-soft-fp.ll to lakemont.ll, since soft-fp is already implied and mentioned in the comments.

[echristo]

test/CodeGen/X86/lakemont-soft-fp.ll

2 ↗

(On Diff #52219)

+1

[aturetsk]

Thanks for the review!
The test's name was changed as you suggested.

llvm/trunk/lib/Target/X86/X86.td

def : Proc<"pentium3m",       [FeatureX87, FeatureSlowUAMem16, FeatureMMX,
                                FeatureSSE1, FeatureFXSR, FeatureSlowBTMem]>;
 def : Proc<"pentium-m",       [FeatureX87, FeatureSlowUAMem16, FeatureMMX,
                                FeatureSSE2, FeatureFXSR, FeatureSlowBTMem]>;
 def : Proc<"pentium4",        [FeatureX87, FeatureSlowUAMem16, FeatureMMX,
                                FeatureSSE2, FeatureFXSR]>;
 def : Proc<"pentium4m",       [FeatureX87, FeatureSlowUAMem16, FeatureMMX,
                                FeatureSSE2, FeatureFXSR, FeatureSlowBTMem]>;
 
+// Intel Quark.
+def : Proc<"lakemont",        []>;
+
 // Intel Core Duo.
 def : ProcessorModel<"yonah", SandyBridgeModel,
                      [FeatureX87, FeatureSlowUAMem16, FeatureMMX, FeatureSSE3,
                       FeatureFXSR, FeatureSlowBTMem]>;
 
 // NetBurst.
 def : Proc<"prescott",
            [FeatureX87, FeatureSlowUAMem16, FeatureMMX, FeatureSSE3,

llvm/trunk/test/CodeGen/X86/lakemont.ll

+; RUN: llc < %s -march=x86 -mcpu=lakemont | FileCheck %s
+
+; Make sure -mcpu=lakemont implies soft floats.
+define float @test(float %a, float %b) nounwind readnone {
+; CHECK-LABEL: test:
+; CHECK: __addsf3
+  %add = fadd float %a, %b
+  ret float %add
+}