;
; Verify that register pressure heuristics are working in MachineScheduler.
;
-; When we enable subtree scheduling heuristics on X86, we may need a
-; flag to disable it for this test case.
+; We can further reduce spills in this case with a global register
+; pressure heuristic, like sethi-ullman numbers or biasing toward
+; scheduled subtrees. However, these heuristics are marginally
+; beneficial on x86_64 and exacerbate register pressure in other
+; more complex cases.
;
; CHECK: @wrap_mul4
-; CHECK: 30 regalloc - Number of spills inserted
+; CHECK: 23 regalloc - Number of spills inserted
define void @wrap_mul4(double* nocapture %Out, [4 x double]* nocapture %A, [4 x double]* nocapture %B) #0 {
entry:
ret void
}
-attributes #0 = { noinline nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #0 = { noinline nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }