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llvm-project/llvm/test/Transforms/LoopUnroll/AArch64/runtime-unroll-generic.ll
Joel E. Denny 6d44b9082e
[LoopUnroll] Skip remainder loop guard if skip unrolled loop (#156549) 
The original loop (OL) that serves as input to LoopUnroll has basic
blocks that are arranged as follows:

```
OLPreHeader
OLHeader <-.
...        |
OLLatch ---'
OLExit
```

In this depiction, every block has an implicit edge to the next block
below, so any explicit edge indicates a conditional branch.

Given OL and unroll count N, LoopUnroll sometimes creates an unrolled
loop (UL) with a remainder loop (RL) epilogue arranged like this:

```
,-- ULGuard
|   ULPreHeader
|   ULHeader <-.
|   ...        |
|   ULLatch ---'
|   ULExit
`-> RLGuard -----.
    RLPreHeader  |
,-> RLHeader     |
|   ...          |
`-- RLLatch      |
    RLExit       |
    OLExit <-----'
```

Each UL iteration executes N OL iterations, but each RL iteration
executes 1 OL iteration. ULGuard or RLGuard checks whether the first
iteration of UL or RL should execute, respectively. If so, ULLatch or
RLLatch checks whether to execute each subsequent iteration.

Once reached, OL always executes its first iteration but not necessarily
the next N-1 iterations. Thus, ULGuard is always required before the
first UL iteration. However, when control flows from ULGuard directly to
RLGuard, the first OL iteration has yet to execute, so RLGuard is then
redundant before the first RL iteration.

Thus, this patch makes the following changes:
- Adjust ULGuard to branch to RLPreHeader instead of RLGuard, thus
eliminating RLGuard's unnecessary branch instruction for that path.
- Eliminate the creation of RLGuard phi node poison values. Without this
patch, RLGuard has such a phi node for each value that is defined by any
OL iteration and used in OLExit. The poison value is required where
ULGuard is the predecessor. The poison value indicates that control flow
from ULGuard to RLGuard to Exit has no counterpart in OL because the
first OL iteration must execute either in UL or RL.
- Simplify the CFG by not splitting ULExit and RLGuard because, without
the ULGuard predecessor, the single block can now be a dedicated UL
exit.
- To RLPreHeader, add an `llvm.assume` call that asserts the RL trip
count is non-zero. Without this patch, RLPreHeader is reachable only
when RLGuard guarantees that assertion is true. With this patch, RLGuard
guarantees it only when RLGuard is the predecessor, and the OL structure
guarantees it when ULGuard is the predecessor. If RL itself is unrolled
later, this guarantee somehow prevents ScalarEvolution from giving up
when trying to compute a maximum trip count for RL. That maximum trip
count enables the branch instruction in the final unrolled instance of
RLLatch to be eliminated. Without the `llvm.assume` call, some existing
unroll tests start to fail because that instruction is not eliminated.

The original motivation for this patch is to facilitate later patches
that fix LoopUnroll's computation of branch weights so that they
maintain the block frequency of OL's body (see #135812). Specifically,
this patch ensures RLGuard's branch weights do not affect RL's
contribution to the block frequency of OL's body in the case that
ULGuard skips UL.
2025-10-07 10:45:49 -04:00

212 lines
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes="default<O1>" -mtriple aarch64 -mcpu=cortex-a55 | FileCheck %s -check-prefix=CHECK-A55
; RUN: opt < %s -S -passes="default<O1>" -mtriple aarch64 | FileCheck %s -check-prefix=CHECK-GENERIC
; Testing that, while runtime unrolling is performed on in-order cores (such as the cortex-a55), it is not performed when -mcpu is not specified
define void @runtime_unroll_generic(i32 %arg_0, ptr %arg_1, ptr %arg_2, ptr %arg_3) {
; CHECK-A55-LABEL: @runtime_unroll_generic(
; CHECK-A55-NEXT: entry:
; CHECK-A55-NEXT: [[CMP52_NOT:%.*]] = icmp eq i32 [[ARG_0:%.*]], 0
; CHECK-A55-NEXT: br i1 [[CMP52_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY6_PREHEADER:%.*]]
; CHECK-A55: for.body6.preheader:
; CHECK-A55-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[ARG_0]] to i64
; CHECK-A55-NEXT: [[XTRAITER:%.*]] = and i64 [[WIDE_TRIP_COUNT]], 3
; CHECK-A55-NEXT: [[TMP0:%.*]] = icmp ult i32 [[ARG_0]], 4
; CHECK-A55-NEXT: br i1 [[TMP0]], label [[FOR_END_LOOPEXIT_UNR_LCSSA:%.*]], label [[FOR_BODY6_PREHEADER_NEW:%.*]]
; CHECK-A55: for.body6.preheader.new:
; CHECK-A55-NEXT: [[UNROLL_ITER:%.*]] = and i64 [[WIDE_TRIP_COUNT]], 4294967292
; CHECK-A55-NEXT: br label [[FOR_BODY6:%.*]]
; CHECK-A55: for.body6:
; CHECK-A55-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_BODY6_PREHEADER_NEW]] ], [ [[INDVARS_IV_NEXT_3:%.*]], [[FOR_BODY6]] ]
; CHECK-A55-NEXT: [[NITER:%.*]] = phi i64 [ 0, [[FOR_BODY6_PREHEADER_NEW]] ], [ [[NITER_NEXT_3:%.*]], [[FOR_BODY6]] ]
; CHECK-A55-NEXT: [[ARRAYIDX10:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2:%.*]], i64 [[INDVARS_IV]]
; CHECK-A55-NEXT: [[TMP1:%.*]] = load i16, ptr [[ARRAYIDX10]], align 2
; CHECK-A55-NEXT: [[CONV:%.*]] = sext i16 [[TMP1]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3:%.*]], i64 [[INDVARS_IV]]
; CHECK-A55-NEXT: [[TMP2:%.*]] = load i16, ptr [[ARRAYIDX14]], align 2
; CHECK-A55-NEXT: [[CONV15:%.*]] = sext i16 [[TMP2]] to i32
; CHECK-A55-NEXT: [[MUL16:%.*]] = mul nsw i32 [[CONV15]], [[CONV]]
; CHECK-A55-NEXT: [[ARRAYIDX20:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1:%.*]], i64 [[INDVARS_IV]]
; CHECK-A55-NEXT: [[TMP3:%.*]] = load i32, ptr [[ARRAYIDX20]], align 4
; CHECK-A55-NEXT: [[ADD21:%.*]] = add nsw i32 [[MUL16]], [[TMP3]]
; CHECK-A55-NEXT: store i32 [[ADD21]], ptr [[ARRAYIDX20]], align 4
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT:%.*]] = or disjoint i64 [[INDVARS_IV]], 1
; CHECK-A55-NEXT: [[ARRAYIDX10_1:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_NEXT]]
; CHECK-A55-NEXT: [[TMP4:%.*]] = load i16, ptr [[ARRAYIDX10_1]], align 2
; CHECK-A55-NEXT: [[CONV_1:%.*]] = sext i16 [[TMP4]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_1:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_NEXT]]
; CHECK-A55-NEXT: [[TMP5:%.*]] = load i16, ptr [[ARRAYIDX14_1]], align 2
; CHECK-A55-NEXT: [[CONV15_1:%.*]] = sext i16 [[TMP5]] to i32
; CHECK-A55-NEXT: [[MUL16_1:%.*]] = mul nsw i32 [[CONV15_1]], [[CONV_1]]
; CHECK-A55-NEXT: [[ARRAYIDX20_1:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_NEXT]]
; CHECK-A55-NEXT: [[TMP6:%.*]] = load i32, ptr [[ARRAYIDX20_1]], align 4
; CHECK-A55-NEXT: [[ADD21_1:%.*]] = add nsw i32 [[MUL16_1]], [[TMP6]]
; CHECK-A55-NEXT: store i32 [[ADD21_1]], ptr [[ARRAYIDX20_1]], align 4
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT_1:%.*]] = or disjoint i64 [[INDVARS_IV]], 2
; CHECK-A55-NEXT: [[ARRAYIDX10_2:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_NEXT_1]]
; CHECK-A55-NEXT: [[TMP7:%.*]] = load i16, ptr [[ARRAYIDX10_2]], align 2
; CHECK-A55-NEXT: [[CONV_2:%.*]] = sext i16 [[TMP7]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_2:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_NEXT_1]]
; CHECK-A55-NEXT: [[TMP8:%.*]] = load i16, ptr [[ARRAYIDX14_2]], align 2
; CHECK-A55-NEXT: [[CONV15_2:%.*]] = sext i16 [[TMP8]] to i32
; CHECK-A55-NEXT: [[MUL16_2:%.*]] = mul nsw i32 [[CONV15_2]], [[CONV_2]]
; CHECK-A55-NEXT: [[ARRAYIDX20_2:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_NEXT_1]]
; CHECK-A55-NEXT: [[TMP9:%.*]] = load i32, ptr [[ARRAYIDX20_2]], align 4
; CHECK-A55-NEXT: [[ADD21_2:%.*]] = add nsw i32 [[MUL16_2]], [[TMP9]]
; CHECK-A55-NEXT: store i32 [[ADD21_2]], ptr [[ARRAYIDX20_2]], align 4
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT_2:%.*]] = or disjoint i64 [[INDVARS_IV]], 3
; CHECK-A55-NEXT: [[ARRAYIDX10_3:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_NEXT_2]]
; CHECK-A55-NEXT: [[TMP10:%.*]] = load i16, ptr [[ARRAYIDX10_3]], align 2
; CHECK-A55-NEXT: [[CONV_3:%.*]] = sext i16 [[TMP10]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_3:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_NEXT_2]]
; CHECK-A55-NEXT: [[TMP11:%.*]] = load i16, ptr [[ARRAYIDX14_3]], align 2
; CHECK-A55-NEXT: [[CONV15_3:%.*]] = sext i16 [[TMP11]] to i32
; CHECK-A55-NEXT: [[MUL16_3:%.*]] = mul nsw i32 [[CONV15_3]], [[CONV_3]]
; CHECK-A55-NEXT: [[ARRAYIDX20_3:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_NEXT_2]]
; CHECK-A55-NEXT: [[TMP12:%.*]] = load i32, ptr [[ARRAYIDX20_3]], align 4
; CHECK-A55-NEXT: [[ADD21_3:%.*]] = add nsw i32 [[MUL16_3]], [[TMP12]]
; CHECK-A55-NEXT: store i32 [[ADD21_3]], ptr [[ARRAYIDX20_3]], align 4
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT_3]] = add nuw nsw i64 [[INDVARS_IV]], 4
; CHECK-A55-NEXT: [[NITER_NEXT_3]] = add i64 [[NITER]], 4
; CHECK-A55-NEXT: [[NITER_NCMP_3:%.*]] = icmp eq i64 [[NITER_NEXT_3]], [[UNROLL_ITER]]
; CHECK-A55-NEXT: br i1 [[NITER_NCMP_3]], label [[FOR_END_LOOPEXIT_UNR_LCSSA1:%.*]], label [[FOR_BODY6]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-A55: for.end.loopexit.unr-lcssa:
; CHECK-A55-NEXT: [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 0
; CHECK-A55-NEXT: br i1 [[LCMP_MOD_NOT]], label [[FOR_END]], label [[FOR_END_LOOPEXIT_UNR_LCSSA]]
; CHECK-A55: for.body6.epil.preheader:
; CHECK-A55-NEXT: [[INDVARS_IV_UNR:%.*]] = phi i64 [ 0, [[FOR_BODY6_PREHEADER]] ], [ [[INDVARS_IV_NEXT_3]], [[FOR_END_LOOPEXIT_UNR_LCSSA1]] ]
; CHECK-A55-NEXT: [[LCMP_MOD5:%.*]] = icmp ne i64 [[XTRAITER]], 0
; CHECK-A55-NEXT: tail call void @llvm.assume(i1 [[LCMP_MOD5]])
; CHECK-A55-NEXT: [[ARRAYIDX10_EPIL:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_UNR]]
; CHECK-A55-NEXT: [[TMP13:%.*]] = load i16, ptr [[ARRAYIDX10_EPIL]], align 2
; CHECK-A55-NEXT: [[CONV_EPIL:%.*]] = sext i16 [[TMP13]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_EPIL:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_UNR]]
; CHECK-A55-NEXT: [[TMP14:%.*]] = load i16, ptr [[ARRAYIDX14_EPIL]], align 2
; CHECK-A55-NEXT: [[CONV15_EPIL:%.*]] = sext i16 [[TMP14]] to i32
; CHECK-A55-NEXT: [[MUL16_EPIL:%.*]] = mul nsw i32 [[CONV15_EPIL]], [[CONV_EPIL]]
; CHECK-A55-NEXT: [[ARRAYIDX20_EPIL:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_UNR]]
; CHECK-A55-NEXT: [[TMP15:%.*]] = load i32, ptr [[ARRAYIDX20_EPIL]], align 4
; CHECK-A55-NEXT: [[ADD21_EPIL:%.*]] = add nsw i32 [[MUL16_EPIL]], [[TMP15]]
; CHECK-A55-NEXT: store i32 [[ADD21_EPIL]], ptr [[ARRAYIDX20_EPIL]], align 4
; CHECK-A55-NEXT: [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 1
; CHECK-A55-NEXT: br i1 [[EPIL_ITER_CMP_NOT]], label [[FOR_END]], label [[FOR_BODY6_EPIL_1:%.*]]
; CHECK-A55: for.body6.epil.1:
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT_EPIL:%.*]] = add nuw nsw i64 [[INDVARS_IV_UNR]], 1
; CHECK-A55-NEXT: [[ARRAYIDX10_EPIL_1:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_NEXT_EPIL]]
; CHECK-A55-NEXT: [[TMP16:%.*]] = load i16, ptr [[ARRAYIDX10_EPIL_1]], align 2
; CHECK-A55-NEXT: [[CONV_EPIL_1:%.*]] = sext i16 [[TMP16]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_EPIL_1:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_NEXT_EPIL]]
; CHECK-A55-NEXT: [[TMP17:%.*]] = load i16, ptr [[ARRAYIDX14_EPIL_1]], align 2
; CHECK-A55-NEXT: [[CONV15_EPIL_1:%.*]] = sext i16 [[TMP17]] to i32
; CHECK-A55-NEXT: [[MUL16_EPIL_1:%.*]] = mul nsw i32 [[CONV15_EPIL_1]], [[CONV_EPIL_1]]
; CHECK-A55-NEXT: [[ARRAYIDX20_EPIL_1:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_NEXT_EPIL]]
; CHECK-A55-NEXT: [[TMP18:%.*]] = load i32, ptr [[ARRAYIDX20_EPIL_1]], align 4
; CHECK-A55-NEXT: [[ADD21_EPIL_1:%.*]] = add nsw i32 [[MUL16_EPIL_1]], [[TMP18]]
; CHECK-A55-NEXT: store i32 [[ADD21_EPIL_1]], ptr [[ARRAYIDX20_EPIL_1]], align 4
; CHECK-A55-NEXT: [[EPIL_ITER_CMP_1_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 2
; CHECK-A55-NEXT: br i1 [[EPIL_ITER_CMP_1_NOT]], label [[FOR_END]], label [[FOR_BODY6_EPIL_2:%.*]]
; CHECK-A55: for.body6.epil.2:
; CHECK-A55-NEXT: [[INDVARS_IV_NEXT_EPIL_1:%.*]] = add nuw nsw i64 [[INDVARS_IV_UNR]], 2
; CHECK-A55-NEXT: [[ARRAYIDX10_EPIL_2:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2]], i64 [[INDVARS_IV_NEXT_EPIL_1]]
; CHECK-A55-NEXT: [[TMP19:%.*]] = load i16, ptr [[ARRAYIDX10_EPIL_2]], align 2
; CHECK-A55-NEXT: [[CONV_EPIL_2:%.*]] = sext i16 [[TMP19]] to i32
; CHECK-A55-NEXT: [[ARRAYIDX14_EPIL_2:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3]], i64 [[INDVARS_IV_NEXT_EPIL_1]]
; CHECK-A55-NEXT: [[TMP20:%.*]] = load i16, ptr [[ARRAYIDX14_EPIL_2]], align 2
; CHECK-A55-NEXT: [[CONV15_EPIL_2:%.*]] = sext i16 [[TMP20]] to i32
; CHECK-A55-NEXT: [[MUL16_EPIL_2:%.*]] = mul nsw i32 [[CONV15_EPIL_2]], [[CONV_EPIL_2]]
; CHECK-A55-NEXT: [[ARRAYIDX20_EPIL_2:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1]], i64 [[INDVARS_IV_NEXT_EPIL_1]]
; CHECK-A55-NEXT: [[TMP21:%.*]] = load i32, ptr [[ARRAYIDX20_EPIL_2]], align 4
; CHECK-A55-NEXT: [[ADD21_EPIL_2:%.*]] = add nsw i32 [[MUL16_EPIL_2]], [[TMP21]]
; CHECK-A55-NEXT: store i32 [[ADD21_EPIL_2]], ptr [[ARRAYIDX20_EPIL_2]], align 4
; CHECK-A55-NEXT: br label [[FOR_END]]
; CHECK-A55: for.end:
; CHECK-A55-NEXT: ret void
;
; CHECK-GENERIC-LABEL: @runtime_unroll_generic(
; CHECK-GENERIC-NEXT: entry:
; CHECK-GENERIC-NEXT: [[CMP52_NOT:%.*]] = icmp eq i32 [[ARG_0:%.*]], 0
; CHECK-GENERIC-NEXT: br i1 [[CMP52_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY6_PREHEADER:%.*]]
; CHECK-GENERIC: for.body6.preheader:
; CHECK-GENERIC-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[ARG_0]] to i64
; CHECK-GENERIC-NEXT: br label [[FOR_BODY6:%.*]]
; CHECK-GENERIC: for.body6:
; CHECK-GENERIC-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_BODY6_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY6]] ]
; CHECK-GENERIC-NEXT: [[ARRAYIDX10:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_2:%.*]], i64 [[INDVARS_IV]]
; CHECK-GENERIC-NEXT: [[TMP0:%.*]] = load i16, ptr [[ARRAYIDX10]], align 2
; CHECK-GENERIC-NEXT: [[CONV:%.*]] = sext i16 [[TMP0]] to i32
; CHECK-GENERIC-NEXT: [[ARRAYIDX14:%.*]] = getelementptr inbounds nuw i16, ptr [[ARG_3:%.*]], i64 [[INDVARS_IV]]
; CHECK-GENERIC-NEXT: [[TMP1:%.*]] = load i16, ptr [[ARRAYIDX14]], align 2
; CHECK-GENERIC-NEXT: [[CONV15:%.*]] = sext i16 [[TMP1]] to i32
; CHECK-GENERIC-NEXT: [[MUL16:%.*]] = mul nsw i32 [[CONV15]], [[CONV]]
; CHECK-GENERIC-NEXT: [[ARRAYIDX20:%.*]] = getelementptr inbounds nuw i32, ptr [[ARG_1:%.*]], i64 [[INDVARS_IV]]
; CHECK-GENERIC-NEXT: [[TMP2:%.*]] = load i32, ptr [[ARRAYIDX20]], align 4
; CHECK-GENERIC-NEXT: [[ADD21:%.*]] = add nsw i32 [[MUL16]], [[TMP2]]
; CHECK-GENERIC-NEXT: store i32 [[ADD21]], ptr [[ARRAYIDX20]], align 4
; CHECK-GENERIC-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-GENERIC-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-GENERIC-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY6]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-GENERIC: for.end:
; CHECK-GENERIC-NEXT: ret void
;
entry:
%arg_0.addr = alloca i32, align 4
%arg_1.addr = alloca ptr, align 8
%arg_2.addr = alloca ptr, align 8
%arg_3.addr = alloca ptr, align 8
%k = alloca i32, align 4
store i32 %arg_0, ptr %arg_0.addr, align 4
store ptr %arg_1, ptr %arg_1.addr, align 8
store ptr %arg_2, ptr %arg_2.addr, align 8
store ptr %arg_3, ptr %arg_3.addr, align 8
br label %for.cond
for.cond: ; preds = %entry
br label %for.body
for.body: ; preds = %for.cond
br label %for.cond1
for.cond1: ; preds = %for.body
br label %for.body3
for.body3: ; preds = %for.cond1
store i32 0, ptr %k, align 4
br label %for.cond4
for.cond4: ; preds = %for.inc, %for.body3
%0 = load i32, ptr %k, align 4
%1 = load i32, ptr %arg_0.addr, align 4
%cmp5 = icmp ult i32 %0, %1
br i1 %cmp5, label %for.body6, label %for.end
for.body6: ; preds = %for.cond4
%2 = load ptr, ptr %arg_2.addr, align 8
%idx.ext = zext i32 %0 to i64
%arrayidx10 = getelementptr inbounds i16, ptr %2, i64 %idx.ext
%3 = load i16, ptr %arrayidx10, align 2
%conv = sext i16 %3 to i32
%4 = load ptr, ptr %arg_3.addr, align 8
%arrayidx14 = getelementptr inbounds i16, ptr %4, i64 %idx.ext
%5 = load i16, ptr %arrayidx14, align 2
%conv15 = sext i16 %5 to i32
%mul16 = mul nsw i32 %conv, %conv15
%6 = load ptr, ptr %arg_1.addr, align 8
%arrayidx20 = getelementptr inbounds i32, ptr %6, i64 %idx.ext
%7 = load i32, ptr %arrayidx20, align 4
%add21 = add nsw i32 %7, %mul16
store i32 %add21, ptr %arrayidx20, align 4
br label %for.inc
for.inc: ; preds = %for.body6
%8 = load i32, ptr %k, align 4
%inc = add i32 %8, 1
store i32 %inc, ptr %k, align 4
br label %for.cond4, !llvm.loop !0
for.end: ; preds = %for.cond4
ret void
}
!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.mustprogress"}
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