llvm/test/Analysis/ScalarEvolution/load-with-range-metadata.ll
Sanjoy Das 65f2077c62 This patch teaches ScalarEvolution to pick and use !range metadata.
It also makes it more aggressive in querying range information by
adding a call to isKnownPredicateWithRanges to
isLoopBackedgeGuardedByCond and isLoopEntryGuardedByCond.

phabricator: http://reviews.llvm.org/D5638

Reviewed by: atrick, hfinkel



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219532 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-10 21:22:34 +00:00

38 lines
971 B
LLVM

; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
define i32 @slt_trip_count_with_range(i32 *%ptr0, i32 *%ptr1) {
; CHECK-LABEL: slt_trip_count_with_range
entry:
%limit = load i32* %ptr0, !range !0
br label %loop
loop:
; CHECK: Loop %loop: max backedge-taken count is 98
%index = phi i32 [ 0, %entry ], [ %index.inc, %loop ]
%index.inc = add i32 %index, 1
%continue = icmp slt i32 %index.inc, %limit
br i1 %continue, label %loop, label %loop.exit
loop.exit:
ret i32 0
}
define i32 @ult_trip_count_with_range(i32 *%ptr0, i32 *%ptr1) {
; CHECK-LABEL: ult_trip_count_with_range
entry:
%limit = load i32* %ptr0, !range !0
br label %loop
loop:
; CHECK: Loop %loop: max backedge-taken count is 98
%index = phi i32 [ 0, %entry ], [ %index.inc, %loop ]
%index.inc = add i32 %index, 1
%continue = icmp ult i32 %index.inc, %limit
br i1 %continue, label %loop, label %loop.exit
loop.exit:
ret i32 0
}
!0 = metadata !{i32 1, i32 100}