1 files changed, 66 insertions, 0 deletions
diff --git a/test/CodeGen/X86/subtarget-feature-change.ll b/test/CodeGen/X86/subtarget-feature-change.ll
new file mode 100644
index 0000000..cd67729
--- /dev/null
+++ b/test/CodeGen/X86/subtarget-feature-change.ll
@@ -0,0 +1,66 @@
+; RUN: llc < %s -march=x86-64 | FileCheck %s
+
+; This should not generate SSE instructions:
+;
+; CHECK: without.sse:
+; CHECK: flds
+; CHECK: fmuls
+; CHECK: fstps
+define void @without.sse(float* nocapture %a, float* nocapture %b, float* nocapture %c, i32 %n) #0 {
+entry:
+  %cmp9 = icmp sgt i32 %n, 0
+  br i1 %cmp9, label %for.body, label %for.end
+
+for.body:
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds float* %b, i64 %indvars.iv
+  %0 = load float* %arrayidx, align 4, !tbaa !0
+  %arrayidx2 = getelementptr inbounds float* %c, i64 %indvars.iv
+  %1 = load float* %arrayidx2, align 4, !tbaa !0
+  %mul = fmul float %0, %1
+  %arrayidx4 = getelementptr inbounds float* %a, i64 %indvars.iv
+  store float %mul, float* %arrayidx4, align 4, !tbaa !0
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+; This should generate SSE instructions:
+;
+; CHECK: with.sse
+; CHECK: movss
+; CHECK: mulss
+; CHECK: movss
+define void @with.sse(float* nocapture %a, float* nocapture %b, float* nocapture %c, i32 %n) #1 {
+entry:
+  %cmp9 = icmp sgt i32 %n, 0
+  br i1 %cmp9, label %for.body, label %for.end
+
+for.body:
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds float* %b, i64 %indvars.iv
+  %0 = load float* %arrayidx, align 4, !tbaa !0
+  %arrayidx2 = getelementptr inbounds float* %c, i64 %indvars.iv
+  %1 = load float* %arrayidx2, align 4, !tbaa !0
+  %mul = fmul float %0, %1
+  %arrayidx4 = getelementptr inbounds float* %a, i64 %indvars.iv
+  store float %mul, float* %arrayidx4, align 4, !tbaa !0
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+attributes #0 = { nounwind optsize ssp uwtable "target-cpu"="core2" "target-features"="-sse4a,-avx2,-xop,-fma4,-bmi2,-3dnow,-3dnowa,-pclmul,-sse,-avx,-sse41,-ssse3,+mmx,-rtm,-sse42,-lzcnt,-f16c,-popcnt,-bmi,-aes,-fma,-rdrand,-sse2,-sse3" }
+attributes #1 = { nounwind optsize ssp uwtable "target-cpu"="core2" "target-features"="-sse4a,-avx2,-xop,-fma4,-bmi2,-3dnow,-3dnowa,-pclmul,+sse,-avx,-sse41,+ssse3,+mmx,-rtm,-sse42,-lzcnt,-f16c,-popcnt,-bmi,-aes,-fma,-rdrand,+sse2,+sse3" }
+
+!0 = metadata !{metadata !"float", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}