trip-count-pow2.ll
2.13 KB
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; RUN: opt < %s -scalar-evolution -analyze -enable-new-pm=0 | FileCheck %s
; RUN: opt < %s "-passes=print<scalar-evolution>" -disable-output 2>&1 | FileCheck %s
define void @test1(i32 %n) {
entry:
%s = mul i32 %n, 96
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%i.next = add i32 %i, 32
%t = icmp ne i32 %i.next, %s
br i1 %t, label %loop, label %exit
exit:
ret void
; CHECK-LABEL: @test1
; CHECK: Loop %loop: backedge-taken count is ((-32 + (96 * %n)) /u 32)
; CHECK: Loop %loop: max backedge-taken count is 134217727
}
; PR19183
define i32 @test2(i32 %n) {
entry:
%s = and i32 %n, -32
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%i.next = add i32 %i, 32
%t = icmp ne i32 %i.next, %s
br i1 %t, label %loop, label %exit
exit:
ret i32 %i
; CHECK-LABEL: @test2
; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * (%n /u 32))<nuw>) /u 32)
; CHECK: Loop %loop: max backedge-taken count is 134217727
}
define void @test3(i32 %n) {
entry:
%s = mul i32 %n, 96
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%i.next = add i32 %i, 96
%t = icmp ne i32 %i.next, %s
br i1 %t, label %loop, label %exit
exit:
ret void
; CHECK-LABEL: @test3
; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * %n)) /u 32)
; CHECK: Loop %loop: max backedge-taken count is 134217727
}
define void @test4(i32 %n) {
entry:
%s = mul i32 %n, 4
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%i.next = add i32 %i, 12
%t = icmp ne i32 %i.next, %s
br i1 %t, label %loop, label %exit
exit:
ret void
; CHECK-LABEL: @test4
; CHECK: Loop %loop: backedge-taken count is ((-4 + (-1431655764 * %n)) /u 4)
; CHECK: Loop %loop: max backedge-taken count is 1073741823
}
define void @test5(i32 %n) {
entry:
%s = mul i32 %n, 4
br label %loop
loop:
%i = phi i32 [ %s, %entry ], [ %i.next, %loop ]
%i.next = add i32 %i, -4
%t = icmp ne i32 %i.next, 0
br i1 %t, label %loop, label %exit
exit:
ret void
; CHECK-LABEL: @test5
; CHECK: Loop %loop: backedge-taken count is ((-4 + (4 * %n)) /u 4)
; CHECK: Loop %loop: max backedge-taken count is 1073741823
}