[llvm] 72f99b7 - [LV] Add test case with branch weights.
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Sat Jun 14 08:50:11 PDT 2025
Author: Florian Hahn
Date: 2025-06-14T16:48:44+01:00
New Revision: 72f99b75afc12bb15a7730544339bcc1ca11e8ee
URL: https://github.com/llvm/llvm-project/commit/72f99b75afc12bb15a7730544339bcc1ca11e8ee
DIFF: https://github.com/llvm/llvm-project/commit/72f99b75afc12bb15a7730544339bcc1ca11e8ee.diff
LOG: [LV] Add test case with branch weights.
Add test case with branch weights where the vector loop can
be removed. Exposed a crash with db8d34db26e9
(https://github.com/llvm/llvm-project/pull/143035).
Added:
llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-branch-weights.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-branch-weights.ll b/llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-branch-weights.ll
new file mode 100644
index 0000000000000..d5acf5c38f768
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-branch-weights.ll
@@ -0,0 +1,145 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
+; RUN: opt -p loop-vectorize -force-vector-width=8 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=VF8UF1 %s
+; RUN: opt -p loop-vectorize -force-vector-width=8 -force-vector-interleave=2 -S %s | FileCheck --check-prefixes=VF8UF2 %s
+; RUN: opt -p loop-vectorize -force-vector-width=16 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=VF16UF1 %s
+
+; Check if the vector loop condition can be simplified to true for a given
+; VF/IC combination.
+define void @test_tc_between_8_and_17(ptr %A, i64 range(i64 8, 17) %N) {
+; VF8UF1-LABEL: define void @test_tc_between_8_and_17(
+; VF8UF1-SAME: ptr [[A:%.*]], i64 range(i64 8, 17) [[N:%.*]]) {
+; VF8UF1-NEXT: [[ENTRY:.*]]:
+; VF8UF1-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]], !prof [[PROF0:![0-9]+]]
+; VF8UF1: [[VECTOR_PH]]:
+; VF8UF1-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 8
+; VF8UF1-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
+; VF8UF1-NEXT: [[TMP0:%.*]] = getelementptr i8, ptr [[A]], i64 [[N_VEC]]
+; VF8UF1-NEXT: br label %[[VECTOR_BODY:.*]]
+; VF8UF1: [[VECTOR_BODY]]:
+; VF8UF1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; VF8UF1-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[A]], i64 [[INDEX]]
+; VF8UF1-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 0
+; VF8UF1-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[TMP1]], align 1
+; VF8UF1-NEXT: [[TMP2:%.*]] = add nsw <8 x i8> [[WIDE_LOAD]], splat (i8 10)
+; VF8UF1-NEXT: store <8 x i8> [[TMP2]], ptr [[TMP1]], align 1
+; VF8UF1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
+; VF8UF1-NEXT: [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; VF8UF1-NEXT: br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
+; VF8UF1: [[MIDDLE_BLOCK]]:
+; VF8UF1-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
+; VF8UF1-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]], !prof [[PROF5:![0-9]+]]
+; VF8UF1: [[SCALAR_PH]]:
+; VF8UF1-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
+; VF8UF1-NEXT: [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[TMP0]], %[[MIDDLE_BLOCK]] ], [ [[A]], %[[ENTRY]] ]
+; VF8UF1-NEXT: br label %[[LOOP:.*]]
+; VF8UF1: [[LOOP]]:
+; VF8UF1-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
+; VF8UF1-NEXT: [[P_SRC:%.*]] = phi ptr [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ], [ [[P_SRC_NEXT:%.*]], %[[LOOP]] ]
+; VF8UF1-NEXT: [[P_SRC_NEXT]] = getelementptr inbounds i8, ptr [[P_SRC]], i64 1
+; VF8UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
+; VF8UF1-NEXT: [[ADD:%.*]] = add nsw i8 [[L]], 10
+; VF8UF1-NEXT: store i8 [[ADD]], ptr [[P_SRC]], align 1
+; VF8UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
+; VF8UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
+; VF8UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP]], !prof [[PROF6:![0-9]+]], !llvm.loop [[LOOP7:![0-9]+]]
+; VF8UF1: [[EXIT]]:
+; VF8UF1-NEXT: ret void
+;
+; VF8UF2-LABEL: define void @test_tc_between_8_and_17(
+; VF8UF2-SAME: ptr [[A:%.*]], i64 range(i64 8, 17) [[N:%.*]]) {
+; VF8UF2-NEXT: [[ENTRY:.*]]:
+; VF8UF2-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 16
+; VF8UF2-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]], !prof [[PROF0:![0-9]+]]
+; VF8UF2: [[VECTOR_PH]]:
+; VF8UF2-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 16
+; VF8UF2-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
+; VF8UF2-NEXT: [[TMP0:%.*]] = getelementptr i8, ptr [[A]], i64 [[N_VEC]]
+; VF8UF2-NEXT: br label %[[VECTOR_BODY:.*]]
+; VF8UF2: [[VECTOR_BODY]]:
+; VF8UF2-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[A]], i32 0
+; VF8UF2-NEXT: [[TMP2:%.*]] = getelementptr i8, ptr [[A]], i32 8
+; VF8UF2-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[TMP1]], align 1
+; VF8UF2-NEXT: [[WIDE_LOAD1:%.*]] = load <8 x i8>, ptr [[TMP2]], align 1
+; VF8UF2-NEXT: [[TMP3:%.*]] = add nsw <8 x i8> [[WIDE_LOAD]], splat (i8 10)
+; VF8UF2-NEXT: [[TMP4:%.*]] = add nsw <8 x i8> [[WIDE_LOAD1]], splat (i8 10)
+; VF8UF2-NEXT: [[TMP5:%.*]] = getelementptr i8, ptr [[A]], i32 0
+; VF8UF2-NEXT: [[TMP6:%.*]] = getelementptr i8, ptr [[A]], i32 8
+; VF8UF2-NEXT: store <8 x i8> [[TMP3]], ptr [[TMP5]], align 1
+; VF8UF2-NEXT: store <8 x i8> [[TMP4]], ptr [[TMP6]], align 1
+; VF8UF2-NEXT: br label %[[MIDDLE_BLOCK:.*]]
+; VF8UF2: [[MIDDLE_BLOCK]]:
+; VF8UF2-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
+; VF8UF2-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
+; VF8UF2: [[SCALAR_PH]]:
+; VF8UF2-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
+; VF8UF2-NEXT: [[BC_RESUME_VAL2:%.*]] = phi ptr [ [[TMP0]], %[[MIDDLE_BLOCK]] ], [ [[A]], %[[ENTRY]] ]
+; VF8UF2-NEXT: br label %[[LOOP:.*]]
+; VF8UF2: [[LOOP]]:
+; VF8UF2-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
+; VF8UF2-NEXT: [[P_SRC:%.*]] = phi ptr [ [[BC_RESUME_VAL2]], %[[SCALAR_PH]] ], [ [[P_SRC_NEXT:%.*]], %[[LOOP]] ]
+; VF8UF2-NEXT: [[P_SRC_NEXT]] = getelementptr inbounds i8, ptr [[P_SRC]], i64 1
+; VF8UF2-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
+; VF8UF2-NEXT: [[ADD:%.*]] = add nsw i8 [[L]], 10
+; VF8UF2-NEXT: store i8 [[ADD]], ptr [[P_SRC]], align 1
+; VF8UF2-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
+; VF8UF2-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
+; VF8UF2-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
+; VF8UF2: [[EXIT]]:
+; VF8UF2-NEXT: ret void
+;
+; VF16UF1-LABEL: define void @test_tc_between_8_and_17(
+; VF16UF1-SAME: ptr [[A:%.*]], i64 range(i64 8, 17) [[N:%.*]]) {
+; VF16UF1-NEXT: [[ENTRY:.*]]:
+; VF16UF1-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 16
+; VF16UF1-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]], !prof [[PROF0:![0-9]+]]
+; VF16UF1: [[VECTOR_PH]]:
+; VF16UF1-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], 16
+; VF16UF1-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
+; VF16UF1-NEXT: [[TMP0:%.*]] = getelementptr i8, ptr [[A]], i64 [[N_VEC]]
+; VF16UF1-NEXT: br label %[[VECTOR_BODY:.*]]
+; VF16UF1: [[VECTOR_BODY]]:
+; VF16UF1-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[A]], i32 0
+; VF16UF1-NEXT: [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[TMP1]], align 1
+; VF16UF1-NEXT: [[TMP2:%.*]] = add nsw <16 x i8> [[WIDE_LOAD]], splat (i8 10)
+; VF16UF1-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr [[A]], i32 0
+; VF16UF1-NEXT: store <16 x i8> [[TMP2]], ptr [[TMP3]], align 1
+; VF16UF1-NEXT: br label %[[MIDDLE_BLOCK:.*]]
+; VF16UF1: [[MIDDLE_BLOCK]]:
+; VF16UF1-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
+; VF16UF1-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
+; VF16UF1: [[SCALAR_PH]]:
+; VF16UF1-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
+; VF16UF1-NEXT: [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[TMP0]], %[[MIDDLE_BLOCK]] ], [ [[A]], %[[ENTRY]] ]
+; VF16UF1-NEXT: br label %[[LOOP:.*]]
+; VF16UF1: [[LOOP]]:
+; VF16UF1-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
+; VF16UF1-NEXT: [[P_SRC:%.*]] = phi ptr [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ], [ [[P_SRC_NEXT:%.*]], %[[LOOP]] ]
+; VF16UF1-NEXT: [[P_SRC_NEXT]] = getelementptr inbounds i8, ptr [[P_SRC]], i64 1
+; VF16UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
+; VF16UF1-NEXT: [[ADD:%.*]] = add nsw i8 [[L]], 10
+; VF16UF1-NEXT: store i8 [[ADD]], ptr [[P_SRC]], align 1
+; VF16UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
+; VF16UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
+; VF16UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
+; VF16UF1: [[EXIT]]:
+; VF16UF1-NEXT: ret void
+;
+entry:
+ br label %loop
+
+loop:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+ %p.src = phi ptr [ %A, %entry ], [ %p.src.next, %loop ]
+ %p.src.next = getelementptr inbounds i8, ptr %p.src, i64 1
+ %l = load i8, ptr %p.src, align 1
+ %add = add nsw i8 %l, 10
+ store i8 %add, ptr %p.src
+ %iv.next = add nsw i64 %iv, 1
+ %cmp = icmp eq i64 %iv.next, %N
+ br i1 %cmp, label %exit, label %loop, !prof !0
+
+exit:
+ ret void
+}
+
+!0 = !{!"branch_weights", !"expected", i32 1, i32 2000}
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