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llvm-project/llvm/test/Transforms/LoopVectorize/constantfolder.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

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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 -force-vector-width=4 -S %s | FileCheck %s
define void @const_fold_ptradd(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_ptradd(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i16 0, ptr [[DST]], align 2
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i16, ptr [[DST]], i64 [[CONST_0]]
; CHECK-NEXT: store i16 0, ptr [[GEP]], align 2
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
%gep = getelementptr i16, ptr %dst, i64 %const.0
store i16 0, ptr %gep, align 2
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_inbounds_ptradd(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_inbounds_ptradd(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i16 0, ptr [[DST]], align 2
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i16, ptr [[DST]], i64 [[CONST_0]]
; CHECK-NEXT: store i16 0, ptr [[GEP]], align 2
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
%gep = getelementptr inbounds i16, ptr %dst, i64 %const.0
store i16 0, ptr %gep, align 2
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_select(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_select(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP3:%.*]] = or i64 [[D]], 1
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i64 [[TMP3]], ptr [[DST]], align 8
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[OR:%.*]] = or i64 [[D]], [[CONST_1]]
; CHECK-NEXT: store i64 [[OR]], ptr [[DST]], align 8
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
%or = or i64 %d, %const.1
store i64 %or, ptr %dst, align 8
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_add_sub_mul_ashr_lshr(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_add_sub_mul_ashr_lshr(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i64 1, ptr [[DST]], align 8
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[ADD:%.*]] = add i64 2, [[CONST_1]]
; CHECK-NEXT: [[SUB:%.*]] = sub i64 [[ADD]], [[CONST_1]]
; CHECK-NEXT: [[ASHR:%.*]] = ashr i64 [[SUB]], [[CONST_1]]
; CHECK-NEXT: [[MUL:%.*]] = mul i64 [[ASHR]], 3
; CHECK-NEXT: [[LSHR:%.*]] = lshr i64 [[MUL]], [[CONST_1]]
; CHECK-NEXT: store i64 [[LSHR]], ptr [[DST]], align 8
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
%add = add i64 2, %const.1
%sub = sub i64 %add, %const.1
%ashr = ashr i64 %sub, %const.1
%mul = mul i64 %ashr, 3
%lshr = lshr i64 %mul, %const.1
store i64 %lshr, ptr %dst, align 8
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_and_or_xor(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_and_or_xor(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i64 1, ptr [[DST]], align 8
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[OR:%.*]] = or i64 2, [[CONST_1]]
; CHECK-NEXT: [[AND:%.*]] = and i64 [[OR]], [[CONST_1]]
; CHECK-NEXT: [[XOR:%.*]] = and i64 [[AND]], [[CONST_1]]
; CHECK-NEXT: store i64 [[XOR]], ptr [[DST]], align 8
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
%or = or i64 2, %const.1
%and = and i64 %or, %const.1
%xor = and i64 %and, %const.1
store i64 %xor, ptr %dst, align 8
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_cmp_zext(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_cmp_zext(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i8 1, ptr [[DST]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_1:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 1, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[VAL:%.*]] = icmp ugt i64 2, [[CONST_1]]
; CHECK-NEXT: [[ZEXT:%.*]] = zext i1 [[VAL]] to i8
; CHECK-NEXT: store i8 [[ZEXT]], ptr [[DST]], align 1
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.1 = phi i64 [ %d, %else ], [ 1, %loop.header ]
%val = icmp ugt i64 2, %const.1
%zext = zext i1 %val to i8
store i8 %zext, ptr %dst, align 1
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @const_fold_trunc(ptr %dst, i64 %d) {
; CHECK-LABEL: define void @const_fold_trunc(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[D:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: store i16 0, ptr [[DST]], align 2
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP2]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[EXIT:.*]]
; CHECK: [[SCALAR_PH:.*]]:
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: br i1 true, label %[[LOOP_LATCH]], label %[[ELSE:.*]]
; CHECK: [[ELSE]]:
; CHECK-NEXT: br label %[[LOOP_LATCH]]
; CHECK: [[LOOP_LATCH]]:
; CHECK-NEXT: [[CONST_0:%.*]] = phi i64 [ [[D]], %[[ELSE]] ], [ 0, %[[LOOP_HEADER]] ]
; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 [[CONST_0]] to i16
; CHECK-NEXT: store i16 [[TRUNC]], ptr [[DST]], align 2
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i64 [[IV_NEXT]], 100
; CHECK-NEXT: br i1 [[CMP]], label %[[LOOP_HEADER]], label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
br label %loop.header
loop.header: ; preds = %loop.latch, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
br i1 true, label %loop.latch, label %else
else:
br label %loop.latch
loop.latch:
%const.0 = phi i64 [ %d, %else ], [ 0, %loop.header ]
%trunc = trunc i64 %const.0 to i16
store i16 %trunc, ptr %dst, align 2
%iv.next = add i64 %iv, 1
%cmp = icmp ult i64 %iv.next, 100
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
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