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[SCEV] Add tests where assumes can be used to improve tripe multiple. 

This patch adds a set of tests where information from assumes can be
used to improve the trip multiple.

See PR47904.
This commit is contained in:
Florian Hahn 2020-10-19 17:25:34 +01:00
parent ec0dc70efc
commit 3cbdae22b9
1 changed files with 57 additions and 0 deletions
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57
llvm/test/Analysis/ScalarEvolution/trip-multiple-guard-info.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -analyze -scalar-evolution %s -enable-new-pm=0 | FileCheck %s
; RUN: opt -passes='print<scalar-evolution>' -disable-output %s 2>&1 | FileCheck %s
; Tests for PR47904.
define void @test_trip_multiple_4(i32 %num) {
; CHECK-LABEL: @test_trip_multiple_4
; CHECK: Loop %for.body: backedge-taken count is (-1 + %num)
; CHECK-NEXT: Loop %for.body: max backedge-taken count is -2
; CHECK-NEXT: Loop %for.body: Predicated backedge-taken count is (-1 + %num)
; CHECK: Loop %for.body: Trip multiple is 1
;
entry:
%u = urem i32 %num, 4
%cmp = icmp eq i32 %u, 0
tail call void @llvm.assume(i1 %cmp)
%cmp.1 = icmp uge i32 %num, 4
tail call void @llvm.assume(i1 %cmp.1)
br label %for.body
for.body:
%i.010 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%inc = add nuw nsw i32 %i.010, 1
%cmp2 = icmp ult i32 %inc, %num
br i1 %cmp2, label %for.body, label %exit
exit:
ret void
}
define void @test_trip_multiple_5(i32 %num) {
; CHECK-LABEL: @test_trip_multiple_5
; CHECK: Loop %for.body: backedge-taken count is (-1 + %num)
; CHECK-NEXT: Loop %for.body: max backedge-taken count is -2
; CHECK-NEXT: Loop %for.body: Predicated backedge-taken count is (-1 + %num)
; CHECK: Loop %for.body: Trip multiple is 1
;
entry:
%u = urem i32 %num, 5
%cmp = icmp eq i32 %u, 0
tail call void @llvm.assume(i1 %cmp)
%cmp.1 = icmp uge i32 %num, 5
tail call void @llvm.assume(i1 %cmp.1)
br label %for.body
for.body:
%i.010 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%inc = add nuw nsw i32 %i.010, 1
%cmp2 = icmp ult i32 %inc, %num
br i1 %cmp2, label %for.body, label %exit
exit:
ret void
}
declare void @llvm.assume(i1)