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llvm-mirror/test/Transforms/LoopIdiom/disable-options.ll
Anh Tuyen Tran c3a3d1596a [LoopIdiomRecognizePass] Options to disable part or the entire Loop Idiom Recognize Pass 
Loop Idiom Recognize Pass (LIRP) attempts to transform loops with subscripted arrays
into memcpy/memset function calls. In some particular situation, this transformation
introduces negative impacts. For example: https://bugs.llvm.org/show_bug.cgi?id=47300

This patch will enable users to disable a particular part of the transformation, while
he/she can still enjoy the benefit brought about by the rest of LIRP. The default
behavior stays unchanged: no part of LIRP is disabled by default.

Reviewed By: etiotto (Ettore Tiotto)

Differential Revision: https://reviews.llvm.org/D86262
2020-09-01 13:59:24 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -basic-aa -loop-idiom < %s -S | FileCheck %s --check-prefix=DIS-NONE
; RUN: opt -basic-aa -loop-idiom -disable-loop-idiom-all < %s -S | FileCheck %s --check-prefix=DIS-ALL
; RUN: opt -basic-aa -loop-idiom -disable-loop-idiom-memcpy < %s -S | FileCheck %s --check-prefix=DIS-MEMCPY
; RUN: opt -basic-aa -loop-idiom -disable-loop-idiom-memset < %s -S | FileCheck %s --check-prefix=DIS-MEMSET
; RUN: opt -basic-aa -loop-idiom -disable-loop-idiom-memset -disable-loop-idiom-memcpy < %s -S | FileCheck %s --check-prefix=DIS-ALL
; RUN: opt -passes="loop-idiom" -aa-pipeline=basic-aa < %s -S | FileCheck %s --check-prefix=DIS-NONE
; RUN: opt -passes="loop-idiom" -aa-pipeline=basic-aa -disable-loop-idiom-all < %s -S | FileCheck %s --check-prefix=DIS-ALL
; RUN: opt -passes="loop-idiom" -aa-pipeline=basic-aa -disable-loop-idiom-memcpy < %s -S | FileCheck %s --check-prefix=DIS-MEMCPY
; RUN: opt -passes="loop-idiom" -aa-pipeline=basic-aa -disable-loop-idiom-memset < %s -S | FileCheck %s --check-prefix=DIS-MEMSET
; RUN: opt -passes="loop-idiom" -aa-pipeline=basic-aa -disable-loop-idiom-memset -disable-loop-idiom-memcpy < %s -S | FileCheck %s --check-prefix=DIS-ALL
define void @test-memcpy(i64 %Size) nounwind ssp {
; DIS-NONE-LABEL: @test-memcpy(
; DIS-NONE-NEXT: bb.nph:
; DIS-NONE-NEXT: [[BASE:%.*]] = alloca i8, i32 10000, align 1
; DIS-NONE-NEXT: [[DEST:%.*]] = alloca i8, i32 10000, align 1
; DIS-NONE-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[DEST]], i8* align 1 [[BASE]], i64 [[SIZE:%.*]], i1 false)
; DIS-NONE-NEXT: br label [[FOR_BODY:%.*]]
; DIS-NONE: for.body:
; DIS-NONE-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-NONE-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; DIS-NONE-NEXT: [[DESTI:%.*]] = getelementptr i8, i8* [[DEST]], i64 [[INDVAR]]
; DIS-NONE-NEXT: [[V:%.*]] = load i8, i8* [[I_0_014]], align 1
; DIS-NONE-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-NONE-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE]]
; DIS-NONE-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-NONE: for.end:
; DIS-NONE-NEXT: ret void
;
; DIS-ALL-LABEL: @test-memcpy(
; DIS-ALL-NEXT: bb.nph:
; DIS-ALL-NEXT: [[BASE:%.*]] = alloca i8, i32 10000, align 1
; DIS-ALL-NEXT: [[DEST:%.*]] = alloca i8, i32 10000, align 1
; DIS-ALL-NEXT: br label [[FOR_BODY:%.*]]
; DIS-ALL: for.body:
; DIS-ALL-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-ALL-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; DIS-ALL-NEXT: [[DESTI:%.*]] = getelementptr i8, i8* [[DEST]], i64 [[INDVAR]]
; DIS-ALL-NEXT: [[V:%.*]] = load i8, i8* [[I_0_014]], align 1
; DIS-ALL-NEXT: store i8 [[V]], i8* [[DESTI]], align 1
; DIS-ALL-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-ALL-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE:%.*]]
; DIS-ALL-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-ALL: for.end:
; DIS-ALL-NEXT: ret void
;
; DIS-MEMCPY-LABEL: @test-memcpy(
; DIS-MEMCPY-NEXT: bb.nph:
; DIS-MEMCPY-NEXT: [[BASE:%.*]] = alloca i8, i32 10000, align 1
; DIS-MEMCPY-NEXT: [[DEST:%.*]] = alloca i8, i32 10000, align 1
; DIS-MEMCPY-NEXT: br label [[FOR_BODY:%.*]]
; DIS-MEMCPY: for.body:
; DIS-MEMCPY-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-MEMCPY-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; DIS-MEMCPY-NEXT: [[DESTI:%.*]] = getelementptr i8, i8* [[DEST]], i64 [[INDVAR]]
; DIS-MEMCPY-NEXT: [[V:%.*]] = load i8, i8* [[I_0_014]], align 1
; DIS-MEMCPY-NEXT: store i8 [[V]], i8* [[DESTI]], align 1
; DIS-MEMCPY-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-MEMCPY-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE:%.*]]
; DIS-MEMCPY-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-MEMCPY: for.end:
; DIS-MEMCPY-NEXT: ret void
;
; DIS-MEMSET-LABEL: @test-memcpy(
; DIS-MEMSET-NEXT: bb.nph:
; DIS-MEMSET-NEXT: [[BASE:%.*]] = alloca i8, i32 10000, align 1
; DIS-MEMSET-NEXT: [[DEST:%.*]] = alloca i8, i32 10000, align 1
; DIS-MEMSET-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[DEST]], i8* align 1 [[BASE]], i64 [[SIZE:%.*]], i1 false)
; DIS-MEMSET-NEXT: br label [[FOR_BODY:%.*]]
; DIS-MEMSET: for.body:
; DIS-MEMSET-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-MEMSET-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; DIS-MEMSET-NEXT: [[DESTI:%.*]] = getelementptr i8, i8* [[DEST]], i64 [[INDVAR]]
; DIS-MEMSET-NEXT: [[V:%.*]] = load i8, i8* [[I_0_014]], align 1
; DIS-MEMSET-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-MEMSET-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE]]
; DIS-MEMSET-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-MEMSET: for.end:
; DIS-MEMSET-NEXT: ret void
;
bb.nph:
%Base = alloca i8, i32 10000
%Dest = alloca i8, i32 10000
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8, i8* %Base, i64 %indvar
%DestI = getelementptr i8, i8* %Dest, i64 %indvar
%V = load i8, i8* %I.0.014, align 1
store i8 %V, i8* %DestI, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
define void @test-memset(i8* %Base, i64 %Size) nounwind ssp {
; CHECK-LABEL: @test-memset(
; CHECK-NEXT: bb.nph:
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[BASE:%.*]], i8 0, i64 [[SIZE:%.*]], i1 false)
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; CHECK-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
; DIS-ALL-LABEL: @test-memset(
; DIS-ALL-NEXT: bb.nph:
; DIS-ALL-NEXT: br label [[FOR_BODY:%.*]]
; DIS-ALL: for.body:
; DIS-ALL-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-ALL-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE:%.*]], i64 [[INDVAR]]
; DIS-ALL-NEXT: store i8 0, i8* [[I_0_014]], align 1
; DIS-ALL-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-ALL-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE:%.*]]
; DIS-ALL-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-ALL: for.end:
; DIS-ALL-NEXT: ret void
;
; DIS-MEMCPY-LABEL: @test-memset(
; DIS-MEMCPY-NEXT: bb.nph:
; DIS-MEMCPY-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[BASE:%.*]], i8 0, i64 [[SIZE:%.*]], i1 false)
; DIS-MEMCPY-NEXT: br label [[FOR_BODY:%.*]]
; DIS-MEMCPY: for.body:
; DIS-MEMCPY-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-MEMCPY-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE]], i64 [[INDVAR]]
; DIS-MEMCPY-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-MEMCPY-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE]]
; DIS-MEMCPY-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-MEMCPY: for.end:
; DIS-MEMCPY-NEXT: ret void
;
; DIS-MEMSET-LABEL: @test-memset(
; DIS-MEMSET-NEXT: bb.nph:
; DIS-MEMSET-NEXT: br label [[FOR_BODY:%.*]]
; DIS-MEMSET: for.body:
; DIS-MEMSET-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[BB_NPH:%.*]] ], [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ]
; DIS-MEMSET-NEXT: [[I_0_014:%.*]] = getelementptr i8, i8* [[BASE:%.*]], i64 [[INDVAR]]
; DIS-MEMSET-NEXT: store i8 0, i8* [[I_0_014]], align 1
; DIS-MEMSET-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
; DIS-MEMSET-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVAR_NEXT]], [[SIZE:%.*]]
; DIS-MEMSET-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; DIS-MEMSET: for.end:
; DIS-MEMSET-NEXT: ret void
;
bb.nph: ; preds = %entry
br label %for.body
for.body: ; preds = %bb.nph, %for.body
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8, i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
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