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llvm-project/llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-early-exit.ll
Florian Hahn 50b9ca4dda
[VPlan] Simplify Plan's entry in removeBranchOnConst. (#154510) 
After https://github.com/llvm/llvm-project/pull/153643, there may be a
BranchOnCond with constant condition in the entry block.

Simplify those in removeBranchOnConst. This removes a number of
redundant conditional branch from entry blocks.

In some cases, it may also make the original scalar loop unreachable,
because we know it will never execute. In that case, we need to remove
the loop from LoopInfo, because all unreachable blocks may dominate each
other, making LoopInfo invalid. In those cases, we can also completely
remove the loop, for which I'll share a follow-up patch.

Depends on https://github.com/llvm/llvm-project/pull/153643.

PR: https://github.com/llvm/llvm-project/pull/154510
2025-09-18 19:25:05 +01:00

421 lines
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
; RUN: opt -passes='loop-vectorize,verify<loops>' -force-vector-width=8 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=VF8UF1 %s
; RUN: opt -passes='loop-vectorize,verify<loops>' -force-vector-width=8 -force-vector-interleave=2 -S %s | FileCheck --check-prefixes=VF8UF2 %s
; RUN: opt -passes='loop-vectorize,verify<loops>' -force-vector-width=16 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=VF16UF1 %s
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
; Check if the vector loop condition can be simplified to true for a given
; VF/IC combination.
define i8 @test_early_exit_max_tc_less_than_16(ptr dereferenceable(16) %A) nosync nofree {
; VF8UF1-LABEL: define i8 @test_early_exit_max_tc_less_than_16(
; VF8UF1-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0:[0-9]+]] {
; VF8UF1-NEXT: [[ENTRY:.*:]]
; VF8UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF1: [[VECTOR_PH]]:
; VF8UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF1: [[VECTOR_BODY]]:
; VF8UF1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VF8UF1-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDEX]]
; VF8UF1-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[P_SRC]], align 1
; VF8UF1-NEXT: [[TMP3:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; VF8UF1-NEXT: [[TMP2:%.*]] = freeze <8 x i1> [[TMP3]]
; VF8UF1-NEXT: [[TMP4:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP2]])
; VF8UF1-NEXT: [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; VF8UF1-NEXT: [[TMP6:%.*]] = or i1 [[TMP4]], [[TMP5]]
; VF8UF1-NEXT: br i1 [[TMP6]], label %[[MIDDLE_SPLIT:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; VF8UF1: [[MIDDLE_SPLIT]]:
; VF8UF1-NEXT: br i1 [[TMP4]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF1: [[MIDDLE_BLOCK]]:
; VF8UF1-NEXT: br label %[[EXIT:.*]]
; VF8UF1: [[VECTOR_EARLY_EXIT]]:
; VF8UF1-NEXT: br label %[[EXIT]]
; VF8UF1: [[SCALAR_PH:.*]]:
; VF8UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF1: [[LOOP_HEADER]]:
; VF8UF1-NEXT: [[IV1:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF1-NEXT: [[P_SRC1:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV1]]
; VF8UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC1]], align 1
; VF8UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF1: [[LOOP_LATCH]]:
; VF8UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV1]], 1
; VF8UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF8UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF8UF1: [[EXIT]]:
; VF8UF1-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF8UF1-NEXT: ret i8 [[RES]]
;
; VF8UF2-LABEL: define i8 @test_early_exit_max_tc_less_than_16(
; VF8UF2-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0:[0-9]+]] {
; VF8UF2-NEXT: [[ENTRY:.*:]]
; VF8UF2-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF2: [[VECTOR_PH]]:
; VF8UF2-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF2: [[VECTOR_BODY]]:
; VF8UF2-NEXT: [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[A]], i32 8
; VF8UF2-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[A]], align 1
; VF8UF2-NEXT: [[WIDE_LOAD1:%.*]] = load <8 x i8>, ptr [[TMP0]], align 1
; VF8UF2-NEXT: [[TMP1:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF2-NEXT: [[TMP2:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD1]], zeroinitializer
; VF8UF2-NEXT: [[TMP6:%.*]] = freeze <8 x i1> [[TMP1]]
; VF8UF2-NEXT: [[TMP5:%.*]] = freeze <8 x i1> [[TMP2]]
; VF8UF2-NEXT: [[TMP3:%.*]] = or <8 x i1> [[TMP6]], [[TMP5]]
; VF8UF2-NEXT: [[TMP4:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP3]])
; VF8UF2-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF8UF2: [[MIDDLE_SPLIT]]:
; VF8UF2-NEXT: br i1 [[TMP4]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF2: [[MIDDLE_BLOCK]]:
; VF8UF2-NEXT: br label %[[EXIT:.*]]
; VF8UF2: [[VECTOR_EARLY_EXIT]]:
; VF8UF2-NEXT: br label %[[EXIT]]
; VF8UF2: [[SCALAR_PH:.*]]:
; VF8UF2-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF2: [[LOOP_HEADER]]:
; VF8UF2-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF2-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
; VF8UF2-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
; VF8UF2-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF2-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF2: [[LOOP_LATCH]]:
; VF8UF2-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
; VF8UF2-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF8UF2-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF8UF2: [[EXIT]]:
; VF8UF2-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF8UF2-NEXT: ret i8 [[RES]]
;
; VF16UF1-LABEL: define i8 @test_early_exit_max_tc_less_than_16(
; VF16UF1-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0:[0-9]+]] {
; VF16UF1-NEXT: [[ENTRY:.*:]]
; VF16UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF16UF1: [[VECTOR_PH]]:
; VF16UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF16UF1: [[VECTOR_BODY]]:
; VF16UF1-NEXT: [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[A]], align 1
; VF16UF1-NEXT: [[TMP3:%.*]] = icmp eq <16 x i8> [[WIDE_LOAD]], zeroinitializer
; VF16UF1-NEXT: [[TMP1:%.*]] = freeze <16 x i1> [[TMP3]]
; VF16UF1-NEXT: [[TMP2:%.*]] = call i1 @llvm.vector.reduce.or.v16i1(<16 x i1> [[TMP1]])
; VF16UF1-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF16UF1: [[MIDDLE_SPLIT]]:
; VF16UF1-NEXT: br i1 [[TMP2]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF16UF1: [[MIDDLE_BLOCK]]:
; VF16UF1-NEXT: br label %[[EXIT:.*]]
; VF16UF1: [[VECTOR_EARLY_EXIT]]:
; VF16UF1-NEXT: br label %[[EXIT]]
; VF16UF1: [[SCALAR_PH:.*]]:
; VF16UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF16UF1: [[LOOP_HEADER]]:
; VF16UF1-NEXT: [[IV1:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF16UF1-NEXT: [[P_SRC1:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV1]]
; VF16UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC1]], align 1
; VF16UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF16UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF16UF1: [[LOOP_LATCH]]:
; VF16UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV1]], 1
; VF16UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF16UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF16UF1: [[EXIT]]:
; VF16UF1-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF16UF1-NEXT: ret i8 [[RES]]
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%p.src = getelementptr inbounds i8, ptr %A, i64 %iv
%l = load i8, ptr %p.src, align 1
%c = icmp eq i8 %l, 0
br i1 %c, label %exit, label %loop.latch
loop.latch:
%iv.next = add nsw i64 %iv, 1
%cmp = icmp eq i64 %iv.next, 16
br i1 %cmp, label %exit, label %loop.header
exit:
%res = phi i8 [ 0, %loop.header ], [ 1, %loop.latch ]
ret i8 %res
}
define i64 @test_early_exit_max_tc_less_than_16_with_iv_used_outside(ptr dereferenceable(16) %A) nosync nofree {
; VF8UF1-LABEL: define i64 @test_early_exit_max_tc_less_than_16_with_iv_used_outside(
; VF8UF1-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0]] {
; VF8UF1-NEXT: [[ENTRY:.*:]]
; VF8UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF1: [[VECTOR_PH]]:
; VF8UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF1: [[VECTOR_BODY]]:
; VF8UF1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VF8UF1-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDEX]]
; VF8UF1-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[P_SRC]], align 1
; VF8UF1-NEXT: [[TMP3:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; VF8UF1-NEXT: [[TMP2:%.*]] = freeze <8 x i1> [[TMP3]]
; VF8UF1-NEXT: [[TMP4:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP2]])
; VF8UF1-NEXT: [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; VF8UF1-NEXT: [[TMP6:%.*]] = or i1 [[TMP4]], [[TMP5]]
; VF8UF1-NEXT: br i1 [[TMP6]], label %[[MIDDLE_SPLIT:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; VF8UF1: [[MIDDLE_SPLIT]]:
; VF8UF1-NEXT: br i1 [[TMP4]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF1: [[MIDDLE_BLOCK]]:
; VF8UF1-NEXT: br label %[[EXIT:.*]]
; VF8UF1: [[VECTOR_EARLY_EXIT]]:
; VF8UF1-NEXT: [[FIRST_ACTIVE_LANE:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v8i1(<8 x i1> [[TMP3]], i1 true)
; VF8UF1-NEXT: [[TMP8:%.*]] = add i64 [[INDEX]], [[FIRST_ACTIVE_LANE]]
; VF8UF1-NEXT: br label %[[EXIT]]
; VF8UF1: [[SCALAR_PH:.*]]:
; VF8UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF1: [[LOOP_HEADER]]:
; VF8UF1-NEXT: [[IV1:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF1-NEXT: [[P_SRC1:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV1]]
; VF8UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC1]], align 1
; VF8UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF1: [[LOOP_LATCH]]:
; VF8UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV1]], 1
; VF8UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF8UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF8UF1: [[EXIT]]:
; VF8UF1-NEXT: [[RES:%.*]] = phi i64 [ [[IV1]], %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ [[TMP8]], %[[VECTOR_EARLY_EXIT]] ]
; VF8UF1-NEXT: ret i64 [[RES]]
;
; VF8UF2-LABEL: define i64 @test_early_exit_max_tc_less_than_16_with_iv_used_outside(
; VF8UF2-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0]] {
; VF8UF2-NEXT: [[ENTRY:.*:]]
; VF8UF2-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF2: [[VECTOR_PH]]:
; VF8UF2-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF2: [[VECTOR_BODY]]:
; VF8UF2-NEXT: [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[A]], i32 8
; VF8UF2-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[A]], align 1
; VF8UF2-NEXT: [[WIDE_LOAD1:%.*]] = load <8 x i8>, ptr [[TMP0]], align 1
; VF8UF2-NEXT: [[TMP1:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF2-NEXT: [[TMP2:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD1]], zeroinitializer
; VF8UF2-NEXT: [[TMP13:%.*]] = freeze <8 x i1> [[TMP1]]
; VF8UF2-NEXT: [[TMP6:%.*]] = freeze <8 x i1> [[TMP2]]
; VF8UF2-NEXT: [[TMP3:%.*]] = or <8 x i1> [[TMP13]], [[TMP6]]
; VF8UF2-NEXT: [[TMP4:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP3]])
; VF8UF2-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF8UF2: [[MIDDLE_SPLIT]]:
; VF8UF2-NEXT: br i1 [[TMP4]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF2: [[MIDDLE_BLOCK]]:
; VF8UF2-NEXT: br label %[[EXIT:.*]]
; VF8UF2: [[VECTOR_EARLY_EXIT]]:
; VF8UF2-NEXT: [[TMP5:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v8i1(<8 x i1> [[TMP2]], i1 true)
; VF8UF2-NEXT: [[TMP7:%.*]] = add i64 8, [[TMP5]]
; VF8UF2-NEXT: [[TMP8:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v8i1(<8 x i1> [[TMP1]], i1 true)
; VF8UF2-NEXT: [[TMP9:%.*]] = add i64 0, [[TMP8]]
; VF8UF2-NEXT: [[TMP10:%.*]] = icmp ne i64 [[TMP8]], 8
; VF8UF2-NEXT: [[TMP11:%.*]] = select i1 [[TMP10]], i64 [[TMP9]], i64 [[TMP7]]
; VF8UF2-NEXT: [[TMP12:%.*]] = add i64 0, [[TMP11]]
; VF8UF2-NEXT: br label %[[EXIT]]
; VF8UF2: [[SCALAR_PH:.*]]:
; VF8UF2-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF2: [[LOOP_HEADER]]:
; VF8UF2-NEXT: [[IV1:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF2-NEXT: [[P_SRC1:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV1]]
; VF8UF2-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC1]], align 1
; VF8UF2-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF2-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF2: [[LOOP_LATCH]]:
; VF8UF2-NEXT: [[IV_NEXT]] = add nsw i64 [[IV1]], 1
; VF8UF2-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF8UF2-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF8UF2: [[EXIT]]:
; VF8UF2-NEXT: [[RES:%.*]] = phi i64 [ [[IV1]], %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ [[TMP12]], %[[VECTOR_EARLY_EXIT]] ]
; VF8UF2-NEXT: ret i64 [[RES]]
;
; VF16UF1-LABEL: define i64 @test_early_exit_max_tc_less_than_16_with_iv_used_outside(
; VF16UF1-SAME: ptr dereferenceable(16) [[A:%.*]]) #[[ATTR0]] {
; VF16UF1-NEXT: [[ENTRY:.*:]]
; VF16UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF16UF1: [[VECTOR_PH]]:
; VF16UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF16UF1: [[VECTOR_BODY]]:
; VF16UF1-NEXT: [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[A]], align 1
; VF16UF1-NEXT: [[TMP3:%.*]] = icmp eq <16 x i8> [[WIDE_LOAD]], zeroinitializer
; VF16UF1-NEXT: [[TMP1:%.*]] = freeze <16 x i1> [[TMP3]]
; VF16UF1-NEXT: [[TMP2:%.*]] = call i1 @llvm.vector.reduce.or.v16i1(<16 x i1> [[TMP1]])
; VF16UF1-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF16UF1: [[MIDDLE_SPLIT]]:
; VF16UF1-NEXT: br i1 [[TMP2]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF16UF1: [[MIDDLE_BLOCK]]:
; VF16UF1-NEXT: br label %[[EXIT:.*]]
; VF16UF1: [[VECTOR_EARLY_EXIT]]:
; VF16UF1-NEXT: [[FIRST_ACTIVE_LANE:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v16i1(<16 x i1> [[TMP3]], i1 true)
; VF16UF1-NEXT: [[TMP5:%.*]] = add i64 0, [[FIRST_ACTIVE_LANE]]
; VF16UF1-NEXT: br label %[[EXIT]]
; VF16UF1: [[SCALAR_PH:.*]]:
; VF16UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF16UF1: [[LOOP_HEADER]]:
; VF16UF1-NEXT: [[IV1:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF16UF1-NEXT: [[P_SRC1:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV1]]
; VF16UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC1]], align 1
; VF16UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF16UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF16UF1: [[LOOP_LATCH]]:
; VF16UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV1]], 1
; VF16UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 16
; VF16UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]]
; VF16UF1: [[EXIT]]:
; VF16UF1-NEXT: [[RES:%.*]] = phi i64 [ [[IV1]], %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 1, %[[MIDDLE_BLOCK]] ], [ [[TMP5]], %[[VECTOR_EARLY_EXIT]] ]
; VF16UF1-NEXT: ret i64 [[RES]]
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%p.src = getelementptr inbounds i8, ptr %A, i64 %iv
%l = load i8, ptr %p.src, align 1
%c = icmp eq i8 %l, 0
br i1 %c, label %exit, label %loop.latch
loop.latch:
%iv.next = add nsw i64 %iv, 1
%cmp = icmp eq i64 %iv.next, 16
br i1 %cmp, label %exit, label %loop.header
exit:
%res = phi i64 [ %iv, %loop.header ], [ 1, %loop.latch ]
ret i64 %res
}
define i8 @test_early_exit_max_vector_tc_eq_16(ptr dereferenceable(17) %A) nosync nofree {
; VF8UF1-LABEL: define i8 @test_early_exit_max_vector_tc_eq_16(
; VF8UF1-SAME: ptr dereferenceable(17) [[A:%.*]]) #[[ATTR0]] {
; VF8UF1-NEXT: [[ENTRY:.*:]]
; VF8UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF1: [[VECTOR_PH]]:
; VF8UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF1: [[VECTOR_BODY]]:
; VF8UF1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; VF8UF1-NEXT: [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDEX]]
; VF8UF1-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[TMP0]], align 1
; VF8UF1-NEXT: [[TMP1:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; VF8UF1-NEXT: [[TMP5:%.*]] = freeze <8 x i1> [[TMP1]]
; VF8UF1-NEXT: [[TMP2:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP5]])
; VF8UF1-NEXT: [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; VF8UF1-NEXT: [[TMP4:%.*]] = or i1 [[TMP2]], [[TMP3]]
; VF8UF1-NEXT: br i1 [[TMP4]], label %[[MIDDLE_SPLIT:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; VF8UF1: [[MIDDLE_SPLIT]]:
; VF8UF1-NEXT: br i1 [[TMP2]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF1: [[MIDDLE_BLOCK]]:
; VF8UF1-NEXT: br label %[[SCALAR_PH:.*]]
; VF8UF1: [[VECTOR_EARLY_EXIT]]:
; VF8UF1-NEXT: br label %[[EXIT:.*]]
; VF8UF1: [[SCALAR_PH]]:
; VF8UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF1: [[LOOP_HEADER]]:
; VF8UF1-NEXT: [[IV:%.*]] = phi i64 [ 16, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF1-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
; VF8UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
; VF8UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF1: [[LOOP_LATCH]]:
; VF8UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
; VF8UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 17
; VF8UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP5:![0-9]+]]
; VF8UF1: [[EXIT]]:
; VF8UF1-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF8UF1-NEXT: ret i8 [[RES]]
;
; VF8UF2-LABEL: define i8 @test_early_exit_max_vector_tc_eq_16(
; VF8UF2-SAME: ptr dereferenceable(17) [[A:%.*]]) #[[ATTR0]] {
; VF8UF2-NEXT: [[ENTRY:.*:]]
; VF8UF2-NEXT: br label %[[VECTOR_PH:.*]]
; VF8UF2: [[VECTOR_PH]]:
; VF8UF2-NEXT: br label %[[VECTOR_BODY:.*]]
; VF8UF2: [[VECTOR_BODY]]:
; VF8UF2-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[A]], i32 8
; VF8UF2-NEXT: [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[A]], align 1
; VF8UF2-NEXT: [[WIDE_LOAD1:%.*]] = load <8 x i8>, ptr [[TMP1]], align 1
; VF8UF2-NEXT: [[TMP2:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD]], zeroinitializer
; VF8UF2-NEXT: [[TMP3:%.*]] = icmp eq <8 x i8> [[WIDE_LOAD1]], zeroinitializer
; VF8UF2-NEXT: [[TMP7:%.*]] = freeze <8 x i1> [[TMP2]]
; VF8UF2-NEXT: [[TMP6:%.*]] = freeze <8 x i1> [[TMP3]]
; VF8UF2-NEXT: [[TMP4:%.*]] = or <8 x i1> [[TMP7]], [[TMP6]]
; VF8UF2-NEXT: [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v8i1(<8 x i1> [[TMP4]])
; VF8UF2-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF8UF2: [[MIDDLE_SPLIT]]:
; VF8UF2-NEXT: br i1 [[TMP5]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF8UF2: [[MIDDLE_BLOCK]]:
; VF8UF2-NEXT: br label %[[SCALAR_PH:.*]]
; VF8UF2: [[VECTOR_EARLY_EXIT]]:
; VF8UF2-NEXT: br label %[[EXIT:.*]]
; VF8UF2: [[SCALAR_PH]]:
; VF8UF2-NEXT: br label %[[LOOP_HEADER:.*]]
; VF8UF2: [[LOOP_HEADER]]:
; VF8UF2-NEXT: [[IV:%.*]] = phi i64 [ 16, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF8UF2-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
; VF8UF2-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
; VF8UF2-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF8UF2-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF8UF2: [[LOOP_LATCH]]:
; VF8UF2-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
; VF8UF2-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 17
; VF8UF2-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP0:![0-9]+]]
; VF8UF2: [[EXIT]]:
; VF8UF2-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF8UF2-NEXT: ret i8 [[RES]]
;
; VF16UF1-LABEL: define i8 @test_early_exit_max_vector_tc_eq_16(
; VF16UF1-SAME: ptr dereferenceable(17) [[A:%.*]]) #[[ATTR0]] {
; VF16UF1-NEXT: [[ENTRY:.*:]]
; VF16UF1-NEXT: br label %[[VECTOR_PH:.*]]
; VF16UF1: [[VECTOR_PH]]:
; VF16UF1-NEXT: br label %[[VECTOR_BODY:.*]]
; VF16UF1: [[VECTOR_BODY]]:
; VF16UF1-NEXT: [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[A]], align 1
; VF16UF1-NEXT: [[TMP1:%.*]] = icmp eq <16 x i8> [[WIDE_LOAD]], zeroinitializer
; VF16UF1-NEXT: [[TMP3:%.*]] = freeze <16 x i1> [[TMP1]]
; VF16UF1-NEXT: [[TMP2:%.*]] = call i1 @llvm.vector.reduce.or.v16i1(<16 x i1> [[TMP3]])
; VF16UF1-NEXT: br label %[[MIDDLE_SPLIT:.*]]
; VF16UF1: [[MIDDLE_SPLIT]]:
; VF16UF1-NEXT: br i1 [[TMP2]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[MIDDLE_BLOCK:.*]]
; VF16UF1: [[MIDDLE_BLOCK]]:
; VF16UF1-NEXT: br label %[[SCALAR_PH:.*]]
; VF16UF1: [[VECTOR_EARLY_EXIT]]:
; VF16UF1-NEXT: br label %[[EXIT:.*]]
; VF16UF1: [[SCALAR_PH]]:
; VF16UF1-NEXT: br label %[[LOOP_HEADER:.*]]
; VF16UF1: [[LOOP_HEADER]]:
; VF16UF1-NEXT: [[IV:%.*]] = phi i64 [ 16, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; VF16UF1-NEXT: [[P_SRC:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
; VF16UF1-NEXT: [[L:%.*]] = load i8, ptr [[P_SRC]], align 1
; VF16UF1-NEXT: [[C:%.*]] = icmp eq i8 [[L]], 0
; VF16UF1-NEXT: br i1 [[C]], label %[[EXIT]], label %[[LOOP_LATCH]]
; VF16UF1: [[LOOP_LATCH]]:
; VF16UF1-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], 1
; VF16UF1-NEXT: [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 17
; VF16UF1-NEXT: br i1 [[CMP]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP0:![0-9]+]]
; VF16UF1: [[EXIT]]:
; VF16UF1-NEXT: [[RES:%.*]] = phi i8 [ 0, %[[LOOP_HEADER]] ], [ 1, %[[LOOP_LATCH]] ], [ 0, %[[VECTOR_EARLY_EXIT]] ]
; VF16UF1-NEXT: ret i8 [[RES]]
;
entry:
br label %loop.header
loop.header:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
%p.src = getelementptr inbounds i8, ptr %A, i64 %iv
%l = load i8, ptr %p.src, align 1
%c = icmp eq i8 %l, 0
br i1 %c, label %exit, label %loop.latch
loop.latch:
%iv.next = add nsw i64 %iv, 1
%cmp = icmp eq i64 %iv.next, 17
br i1 %cmp, label %exit, label %loop.header
exit:
%res = phi i8 [ 0, %loop.header ], [ 1, %loop.latch ]
ret i8 %res
}
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