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llvm-mirror/test/Transforms/LoopUnroll/AArch64/unroll-optsize.ll
Florian Hahn 9e1c9bd69d [LoopUnroll] Use LoopSize+1 as threshold, to allow unrolling loops matching LoopSize. 
We use `< UP.Threshold` later on, so we should use LoopSize + 1, to
allow unrolling if the result won't exceed to loop size.

Fixes PR43305.

Reviewers: efriedma, dmgreen, paquette

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D67594

llvm-svn: 372084
2019-09-17 09:02:48 +00:00

172 lines
7.3 KiB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-unroll -mtriple=arm64-apple-iphoneos -S %s | FileCheck %s
; Check we unroll even with optsize, if the result is smaller, either because
; we have single iteration loops or bodies with constant folding opportunities
; after fully unrolling.
declare i32 @get()
define void @fully_unrolled_single_iteration(i32* %src) #0 {
; CHECK-LABEL: @fully_unrolled_single_iteration(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[SRC:%.*]]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT: store i32 [[V]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT: ret void
;
entry:
%arr = alloca [4 x i32], align 4
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%src.idx = getelementptr inbounds i32, i32* %src, i64 %indvars.iv
%v = load i32, i32* %src.idx
%arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
store i32 %v, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 1
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.cond
%ptr = bitcast [4 x i32]* %arr to i32*
call void @use(i32* nonnull %ptr) #4
ret void
}
define void @fully_unrolled_smaller() #0 {
; CHECK-LABEL: @fully_unrolled_smaller(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT: store i32 16, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
; CHECK-NEXT: store i32 4104, i32* [[ARRAYIDX_1]], align 4
; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
; CHECK-NEXT: store i32 1048592, i32* [[ARRAYIDX_2]], align 4
; CHECK-NEXT: [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
; CHECK-NEXT: store i32 268435480, i32* [[ARRAYIDX_3]], align 4
; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT: ret void
;
entry:
%arr = alloca [4 x i32], align 4
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%indvars.iv.tr = trunc i64 %indvars.iv to i32
%shl.0 = shl i32 %indvars.iv.tr, 3
%shl.1 = shl i32 16, %shl.0
%or = or i32 %shl.1, %shl.0
%arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
store i32 %or, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.cond
%ptr = bitcast [4 x i32]* %arr to i32*
call void @use(i32* nonnull %ptr) #4
ret void
}
define void @fully_unrolled_smaller_Oz() #1 {
; CHECK-LABEL: @fully_unrolled_smaller_Oz(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
; CHECK-NEXT: store i32 16, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
; CHECK-NEXT: store i32 4104, i32* [[ARRAYIDX_1]], align 4
; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
; CHECK-NEXT: store i32 1048592, i32* [[ARRAYIDX_2]], align 4
; CHECK-NEXT: [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
; CHECK-NEXT: store i32 268435480, i32* [[ARRAYIDX_3]], align 4
; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT: ret void
;
entry:
%arr = alloca [4 x i32], align 4
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%indvars.iv.tr = trunc i64 %indvars.iv to i32
%shl.0 = shl i32 %indvars.iv.tr, 3
%shl.1 = shl i32 16, %shl.0
%or = or i32 %shl.1, %shl.0
%arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
store i32 %or, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.cond
%ptr = bitcast [4 x i32]* %arr to i32*
call void @use(i32* nonnull %ptr) #4
ret void
}
define void @fully_unrolled_bigger() #0 {
; CHECK-LABEL: @fully_unrolled_bigger(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[INDVARS_IV_TR:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT: [[SHL_0:%.*]] = shl i32 [[INDVARS_IV_TR]], 3
; CHECK-NEXT: [[SHL_1:%.*]] = shl i32 16, [[SHL_0]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHL_1]], [[SHL_0]]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 [[INDVARS_IV]]
; CHECK-NEXT: store i32 [[OR]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV]], 7
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
; CHECK-NEXT: ret void
;
entry:
%arr = alloca [4 x i32], align 4
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%indvars.iv.tr = trunc i64 %indvars.iv to i32
%shl.0 = shl i32 %indvars.iv.tr, 3
%shl.1 = shl i32 16, %shl.0
%or = or i32 %shl.1, %shl.0
%arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
store i32 %or, i32* %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv, 7
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.cond
%ptr = bitcast [4 x i32]* %arr to i32*
call void @use(i32* nonnull %ptr) #4
ret void
}
declare void @use(i32*)
attributes #0 = { optsize }
attributes #1 = { minsize optsize }
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