llvm-project/llvm/test/Analysis/ScalarEvolution/trip-count-switch.ll

32 lines
920 B
LLVM

; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s
; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
declare void @foo()
define void @test1() nounwind {
entry:
br label %for.cond
for.cond: ; preds = %if.end, %entry
%i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
switch i32 %i.0, label %if.end [
i32 0, label %for.end
i32 1, label %if.then
]
if.then: ; preds = %for.cond
tail call void @foo()
br label %if.end
if.end: ; preds = %for.cond, %if.then
%dec = add nsw i32 %i.0, -1
br label %for.cond
for.end: ; preds = %for.cond
ret void
; CHECK-LABEL: @test1
; CHECK: Loop %for.cond: backedge-taken count is 2
; CHECK: Loop %for.cond: max backedge-taken count is 2
}