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clang-p2996/llvm/test/Transforms/LoopInterchange/lcssa-preheader.ll
Florian Hahn 8393b9fd1f [LoopInterchange] Move instructions from preheader to outer loop header. 
Instructions defined in the original inner loop preheader may depend on
values defined in the outer loop header, but the inner loop header will
become the entry block in the loop nest. Move the instructions from the
preheader to the outer loop header, so we do not break dominance. We
also have to check for unsafe instructions in the preheader. If there
are no unsafe instructions, all instructions should be movable.

Currently we move all instructions except the terminator and rely on
LICM to hoist out invariant instructions later.

Fixes PR45743
2020-08-10 12:41:33 +01:00

167 lines
8.1 KiB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -loop-interchange -pass-remarks-missed='loop-interchange' -verify-loop-lcssa -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; void foo(int n, int m) {
; int temp[16][16];
; int res[16][16];
; for(int i = 0; i < n; i++) {
; for(int j = 0; j < m; j++)
; res[j][i] = temp[j][i];
; }
; }
define void @lcssa_08(i32 %n, i32 %m) {
; CHECK-LABEL: @lcssa_08(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TEMP:%.*]] = alloca [16 x [16 x i32]], align 4
; CHECK-NEXT: [[RES:%.*]] = alloca [16 x [16 x i32]], align 4
; CHECK-NEXT: [[CMP24:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP24]], label [[INNER_PREHEADER:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: outer.preheader:
; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
; CHECK: outer.header:
; CHECK-NEXT: [[INDVARS_IV27:%.*]] = phi i64 [ 0, [[OUTER_PREHEADER:%.*]] ], [ [[INDVARS_IV_NEXT28:%.*]], [[OUTER_LATCH:%.*]] ]
; CHECK-NEXT: [[CMP222:%.*]] = icmp sgt i32 [[M:%.*]], 0
; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[M]] to i64
; CHECK-NEXT: br i1 [[CMP222]], label [[INNER_FOR_BODY_SPLIT1:%.*]], label [[OUTER_CRIT_EDGE:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: [[WIDE_TRIP_COUNT29:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT: br label [[INNER_FOR_BODY:%.*]]
; CHECK: inner.for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[INNER_PREHEADER]] ], [ [[TMP1:%.*]], [[INNER_FOR_BODY_SPLIT:%.*]] ]
; CHECK-NEXT: br label [[OUTER_PREHEADER]]
; CHECK: inner.for.body.split1:
; CHECK-NEXT: [[ARRAYIDX6:%.*]] = getelementptr inbounds [16 x [16 x i32]], [16 x [16 x i32]]* [[TEMP]], i64 0, i64 [[INDVARS_IV]], i64 [[INDVARS_IV27]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
; CHECK-NEXT: [[ARRAYIDX8:%.*]] = getelementptr inbounds [16 x [16 x i32]], [16 x [16 x i32]]* [[RES]], i64 0, i64 [[INDVARS_IV]], i64 [[INDVARS_IV27]]
; CHECK-NEXT: store i32 [[TMP0]], i32* [[ARRAYIDX8]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT: br label [[INNER_CRIT_EDGE:%.*]]
; CHECK: inner.for.body.split:
; CHECK-NEXT: [[WIDE_TRIP_COUNT_LCSSA2:%.*]] = phi i64 [ [[WIDE_TRIP_COUNT]], [[OUTER_LATCH]] ]
; CHECK-NEXT: [[TMP1]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[TMP2:%.*]] = icmp ne i64 [[TMP1]], [[WIDE_TRIP_COUNT_LCSSA2]]
; CHECK-NEXT: br i1 [[TMP2]], label [[INNER_FOR_BODY]], label [[OUTER_CRIT_EDGE]]
; CHECK: inner.crit_edge:
; CHECK-NEXT: br label [[OUTER_LATCH]]
; CHECK: outer.latch:
; CHECK-NEXT: [[INDVARS_IV_NEXT28]] = add nuw nsw i64 [[INDVARS_IV27]], 1
; CHECK-NEXT: [[EXITCOND30:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT28]], [[WIDE_TRIP_COUNT29]]
; CHECK-NEXT: br i1 [[EXITCOND30]], label [[OUTER_HEADER]], label [[INNER_FOR_BODY_SPLIT]]
; CHECK: outer.crit_edge:
; CHECK-NEXT: br label [[FOR_COND_CLEANUP]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
;
entry:
%temp = alloca [16 x [16 x i32]], align 4
%res = alloca [16 x [16 x i32]], align 4
%cmp24 = icmp sgt i32 %n, 0
br i1 %cmp24, label %outer.preheader, label %for.cond.cleanup
outer.preheader: ; preds = %entry
%wide.trip.count29 = zext i32 %n to i64
br label %outer.header
outer.header: ; preds = %outer.preheader, %outer.latch
%indvars.iv27 = phi i64 [ 0, %outer.preheader ], [ %indvars.iv.next28, %outer.latch ]
%cmp222 = icmp sgt i32 %m, 0
br i1 %cmp222, label %inner.preheader, label %outer.latch
inner.preheader: ; preds = %outer.header
; When inner.preheader becomes the outer preheader, do not move
; %wide.trip.count into the inner loop header lest LCSSA break
; (if %wide.trip.count gets moved, its use is now outside the inner loop).
%wide.trip.count = zext i32 %m to i64
br label %inner.for.body
inner.for.body: ; preds = %inner.preheader, %inner.for.body
%indvars.iv = phi i64 [ 0, %inner.preheader ], [ %indvars.iv.next, %inner.for.body ]
%arrayidx6 = getelementptr inbounds [16 x [16 x i32]], [16 x [16 x i32]]* %temp, i64 0, i64 %indvars.iv, i64 %indvars.iv27
%0 = load i32, i32* %arrayidx6, align 4
%arrayidx8 = getelementptr inbounds [16 x [16 x i32]], [16 x [16 x i32]]* %res, i64 0, i64 %indvars.iv, i64 %indvars.iv27
store i32 %0, i32* %arrayidx8, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count
br i1 %exitcond, label %inner.for.body, label %inner.crit_edge
inner.crit_edge: ; preds = %inner.for.body
br label %outer.latch
outer.latch: ; preds = %inner.crit_edge, %outer.header
%indvars.iv.next28 = add nuw nsw i64 %indvars.iv27, 1
%exitcond30 = icmp ne i64 %indvars.iv.next28, %wide.trip.count29
br i1 %exitcond30, label %outer.header, label %outer.crit_edge
outer.crit_edge: ; preds = %outer.latch
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %outer.crit_edge, %entry
ret void
}
@global = external local_unnamed_addr global [4 x [4 x [2 x i16]]] align 16
; %N.ext is defined in the outer loop header and used in the inner loop. After
; interchanging, it will be defined in the new inner loop and used in the new;
; outer latch, so we need to create a new LCSSA phi node for it.
define void @test2(i32 %N) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: bb:
; CHECK-NEXT: br label [[INNER_PREHEADER:%.*]]
; CHECK: outer.header.preheader:
; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
; CHECK: outer.header:
; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i64 [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ], [ 0, [[OUTER_HEADER_PREHEADER:%.*]] ]
; CHECK-NEXT: [[N_EXT:%.*]] = sext i32 [[N:%.*]] to i64
; CHECK-NEXT: br label [[INNER_SPLIT1:%.*]]
; CHECK: inner.preheader:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[INNER_IV:%.*]] = phi i64 [ [[TMP0:%.*]], [[INNER_SPLIT:%.*]] ], [ 0, [[INNER_PREHEADER]] ]
; CHECK-NEXT: br label [[OUTER_HEADER_PREHEADER]]
; CHECK: inner.split1:
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds [4 x [4 x [2 x i16]]], [4 x [4 x [2 x i16]]]* @global, i64 0, i64 [[INNER_IV]], i64 [[OUTER_IV]], i64 0
; CHECK-NEXT: [[INNER_IV_NEXT:%.*]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT: [[C_1:%.*]] = icmp ne i64 [[INNER_IV_NEXT]], [[N_EXT]]
; CHECK-NEXT: br label [[OUTER_LATCH]]
; CHECK: inner.split:
; CHECK-NEXT: [[N_EXT_LCSSA:%.*]] = phi i64 [ [[N_EXT]], [[OUTER_LATCH]] ]
; CHECK-NEXT: [[TMP0]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[TMP0]], [[N_EXT_LCSSA]]
; CHECK-NEXT: br i1 [[TMP1]], label [[INNER]], label [[EXIT:%.*]]
; CHECK: outer.latch:
; CHECK-NEXT: [[OUTER_IV_NEXT]] = add nsw i64 [[OUTER_IV]], 1
; CHECK-NEXT: [[C_2:%.*]] = icmp ne i64 [[OUTER_IV]], [[N_EXT]]
; CHECK-NEXT: br i1 [[C_2]], label [[OUTER_HEADER]], label [[INNER_SPLIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
bb:
br label %outer.header
outer.header: ; preds = %bb11, %bb2
%outer.iv = phi i64 [ 0, %bb ], [ %outer.iv.next, %outer.latch ]
%N.ext = sext i32 %N to i64
br label %inner
inner: ; preds = %bb6, %bb4
%inner.iv = phi i64 [ 0, %outer.header ], [ %inner.iv.next, %inner ]
%tmp8 = getelementptr inbounds [4 x [4 x [2 x i16]]], [4 x [4 x [2 x i16]]]* @global, i64 0, i64 %inner.iv, i64 %outer.iv, i64 0
%inner.iv.next = add nsw i64 %inner.iv, 1
%c.1 = icmp ne i64 %inner.iv.next, %N.ext
br i1 %c.1, label %inner, label %outer.latch
outer.latch: ; preds = %bb6
%outer.iv.next = add nsw i64 %outer.iv, 1
%c.2 = icmp ne i64 %outer.iv, %N.ext
br i1 %c.2 , label %outer.header, label %exit
exit: ; preds = %bb11
ret void
}
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