[llvm] 0304fbc - [SCEV] Improve loop guard tests (NFC)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 27 13:35:05 PDT 2021
Author: Nikita Popov
Date: 2021-04-27T22:34:56+02:00
New Revision: 0304fbcd6cc19f855ee266577ce04f49360013a8
URL: https://github.com/llvm/llvm-project/commit/0304fbcd6cc19f855ee266577ce04f49360013a8
DIFF: https://github.com/llvm/llvm-project/commit/0304fbcd6cc19f855ee266577ce04f49360013a8.diff
LOG: [SCEV] Improve loop guard tests (NFC)
Invert the branch order to make the predicate more obvious.
Add tests with two predicates, to show that rewrites are
combined.
Added:
Modified:
llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
Removed:
################################################################################
diff --git a/llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll b/llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
index 7419fa9fd3006..ab64b154c58ba 100644
--- a/llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
+++ b/llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
@@ -633,8 +633,8 @@ define void @test_guard_uge(i32 %blockSize) {
; CHECK: Loop %while.body: Trip multiple is 1
;
%shr = lshr i32 %blockSize, 2
- %guard = icmp ult i32 %blockSize, 4
- br i1 %guard, label %while.end, label %while.body.preheader
+ %guard = icmp uge i32 %blockSize, 4
+ br i1 %guard, label %while.body.preheader, label %while.end
while.body.preheader:
br label %while.body
@@ -669,8 +669,88 @@ define void @test_guard_ugt(i32 %blockSize) {
; CHECK: Loop %while.body: Trip multiple is 1
;
%shr = lshr i32 %blockSize, 2
- %guard = icmp ule i32 %blockSize, 3
- br i1 %guard, label %while.end, label %while.body.preheader
+ %guard = icmp ugt i32 %blockSize, 3
+ br i1 %guard, label %while.body.preheader, label %while.end
+
+while.body.preheader:
+ br label %while.body
+
+while.body:
+ %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
+ %dec = add i32 %iv, -1
+ %cmp.not = icmp eq i32 %dec, 0
+ br i1 %cmp.not, label %while.end.loopexit, label %while.body
+
+while.end.loopexit:
+ br label %while.end
+
+while.end:
+ ret void
+}
+
+define void @test_guard_uge_and_ule(i32 %blockSize) {
+; CHECK-LABEL: 'test_guard_uge_and_ule'
+; CHECK-NEXT: Classifying expressions for: @test_guard_uge_and_ule
+; CHECK-NEXT: %shr = lshr i32 %blockSize, 2
+; CHECK-NEXT: --> (%blockSize /u 4) U: [0,1073741824) S: [0,1073741824)
+; CHECK-NEXT: %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
+; CHECK-NEXT: --> {(%blockSize /u 4),+,-1}<%while.body> U: full-set S: full-set Exits: 1 LoopDispositions: { %while.body: Computable }
+; CHECK-NEXT: %dec = add i32 %iv, -1
+; CHECK-NEXT: --> {(-1 + (%blockSize /u 4))<nsw>,+,-1}<%while.body> U: full-set S: full-set Exits: 0 LoopDispositions: { %while.body: Computable }
+; CHECK-NEXT: Determining loop execution counts for: @test_guard_uge_and_ule
+; CHECK-NEXT: Loop %while.body: backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
+; CHECK-NEXT: Loop %while.body: max backedge-taken count is -1
+; CHECK-NEXT: Loop %while.body: Predicated backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
+; CHECK-NEXT: Predicates:
+; CHECK: Loop %while.body: Trip multiple is 1
+;
+ %shr = lshr i32 %blockSize, 2
+ %guard1 = icmp uge i32 %blockSize, 4
+ br i1 %guard1, label %while.guard, label %while.end
+
+while.guard:
+ %guard2 = icmp ule i32 %blockSize, 1024
+ br i1 %guard2, label %while.body.preheader, label %while.end
+
+while.body.preheader:
+ br label %while.body
+
+while.body:
+ %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
+ %dec = add i32 %iv, -1
+ %cmp.not = icmp eq i32 %dec, 0
+ br i1 %cmp.not, label %while.end.loopexit, label %while.body
+
+while.end.loopexit:
+ br label %while.end
+
+while.end:
+ ret void
+}
+
+define void @test_guard_ugt_and_ult(i32 %blockSize) {
+; CHECK-LABEL: 'test_guard_ugt_and_ult'
+; CHECK-NEXT: Classifying expressions for: @test_guard_ugt_and_ult
+; CHECK-NEXT: %shr = lshr i32 %blockSize, 2
+; CHECK-NEXT: --> (%blockSize /u 4) U: [0,1073741824) S: [0,1073741824)
+; CHECK-NEXT: %iv = phi i32 [ %dec, %while.body ], [ %shr, %while.body.preheader ]
+; CHECK-NEXT: --> {(%blockSize /u 4),+,-1}<%while.body> U: full-set S: full-set Exits: 1 LoopDispositions: { %while.body: Computable }
+; CHECK-NEXT: %dec = add i32 %iv, -1
+; CHECK-NEXT: --> {(-1 + (%blockSize /u 4))<nsw>,+,-1}<%while.body> U: full-set S: full-set Exits: 0 LoopDispositions: { %while.body: Computable }
+; CHECK-NEXT: Determining loop execution counts for: @test_guard_ugt_and_ult
+; CHECK-NEXT: Loop %while.body: backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
+; CHECK-NEXT: Loop %while.body: max backedge-taken count is -1
+; CHECK-NEXT: Loop %while.body: Predicated backedge-taken count is (-1 + (%blockSize /u 4))<nsw>
+; CHECK-NEXT: Predicates:
+; CHECK: Loop %while.body: Trip multiple is 1
+;
+ %shr = lshr i32 %blockSize, 2
+ %guard1 = icmp ugt i32 %blockSize, 3
+ br i1 %guard1, label %while.guard, label %while.end
+
+while.guard:
+ %guard2 = icmp ult i32 %blockSize, 1025
+ br i1 %guard2, label %while.body.preheader, label %while.end
while.body.preheader:
br label %while.body
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