exact-exit-count-more-precise.ll
1.75 KB
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; RUN: opt -analyze -enable-new-pm=0 -scalar-evolution %s | FileCheck %s
; RUN: opt -disable-output "-passes=print<scalar-evolution>" %s 2>&1 | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
define void @test_and(i16 %in) {
br label %bb2
bb2: ; preds = %bb1.i, %bb2, %0
%_tmp44.i = icmp slt i16 %in, 2
br i1 %_tmp44.i, label %bb1.i, label %bb2
bb1.i: ; preds = %bb1.i, %bb2
%_tmp25.i = phi i16 [ %in, %bb2 ], [ %_tmp6.i, %bb1.i ]
%_tmp6.i = add nsw i16 %_tmp25.i, 1
%_tmp10.i = icmp sge i16 %_tmp6.i, 2
%exitcond.i = icmp eq i16 %_tmp6.i, 2
%or.cond = and i1 %_tmp10.i, %exitcond.i
br i1 %or.cond, label %bb2, label %bb1.i
}
; CHECK-LABEL: Determining loop execution counts for: @test_and
; CHECK-NEXT: Loop %bb1.i: backedge-taken count is (1 + (-1 * %in))
; CHECK-NEXT: Loop %bb1.i: max backedge-taken count is -1
; CHECK-NEXT: Loop %bb1.i: Predicated backedge-taken count is (1 + (-1 * %in))
define void @test_or() {
%C10 = icmp slt i1 undef, undef
br i1 %C10, label %BB, label %exit
BB: ; preds = %BB, %0
%indvars.iv = phi i64 [ -1, %BB ], [ -1, %0 ]
%sum.01 = phi i32 [ %2, %BB ], [ undef, %0 ]
%1 = trunc i64 %indvars.iv to i32
%2 = add nsw i32 %1, %sum.01
%B3 = add i32 %1, %2
%C11 = icmp ult i32 %2, %1
%C5 = icmp sle i32 %1, %B3
%B = or i1 %C5, %C11
br i1 %B, label %BB, label %exit
exit: ; preds = %BB, %0
ret void
}
; CHECK-LABEL: Determining loop execution counts for: @test_or
; CHECK-NEXT: Loop %BB: backedge-taken count is undef
; CHECK-NEXT: Loop %BB: max backedge-taken count is -1
; CHECK-NEXT: Loop %BB: Predicated backedge-taken count is undef