0074a462f1
The profiling of the LLVM Test-suite reveals that a significant portion, specifically 14,090 out of 139,323, loop nests were identified as non-viable candidates for transformation, leading to the transform exiting from isComputableLoopNest() without any action. More importantly, dependence information was computed for these loop nests before reaching the function isComputableLoopNest(), which does not require DI and relies solely on scalar evolution (SE). To enhance compile-time efficiency, this patch moves the call to isComputableLoopNest() earlier in the control-flow, thereby avoiding unnecessary dependence calculations. The impact of this change is evident on the compile-time-tracker, with the overall geometric mean improvement recorded at 0.11%, while the lencode benchmark gets a more substantial benefit of 0.44%. This improvement can be tracked in the isc-ln-exp-2 branch under my repo.
365 lines
16 KiB
LLVM
365 lines
16 KiB
LLVM
; RUN: opt < %s -passes=loop-interchange -cache-line-size=64 -pass-remarks-missed='loop-interchange' -pass-remarks-output=%t -S \
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; RUN: -verify-dom-info -verify-loop-info -verify-loop-lcssa -stats 2>&1 | FileCheck %s
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; RUN: FileCheck --input-file=%t --check-prefix=REMARKS %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test1
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Passed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Interchanged
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; REMARKS-NEXT: Function: test1
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define i64 @test1(ptr %Arr) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR2_PREHEADER:%.*]]
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; CHECK: for1.header.preheader:
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; CHECK-NEXT: br label [[FOR1_HEADER:%.*]]
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; CHECK: for1.header:
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; CHECK-NEXT: [[INDVARS_IV23:%.*]] = phi i64 [ [[INDVARS_IV_NEXT24:%.*]], [[FOR1_INC:%.*]] ], [ 0, [[FOR1_HEADER_PREHEADER:%.*]] ]
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; CHECK-NEXT: [[SUM_INNER:%.*]] = phi i64 [ [[SUM_INC:%.*]], [[FOR1_INC]] ], [ [[SUM_OUTER:%.*]], [[FOR1_HEADER_PREHEADER]] ]
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; CHECK-NEXT: br label [[FOR2_SPLIT1:%.*]]
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; CHECK: for2.preheader:
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; CHECK-NEXT: br label [[FOR2:%.*]]
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; CHECK: for2:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT_3:%.*]], [[FOR2_SPLIT:%.*]] ], [ 0, [[FOR2_PREHEADER]] ]
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; CHECK-NEXT: [[SUM_OUTER]] = phi i64 [ [[SUM_INC_LCSSA:%.*]], [[FOR2_SPLIT]] ], [ 0, [[FOR2_PREHEADER]] ]
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; CHECK-NEXT: br label [[FOR1_HEADER_PREHEADER]]
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; CHECK: for2.split1:
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [100 x [100 x i64]], ptr [[ARR:%.*]], i64 0, i64 [[INDVARS_IV]], i64 [[INDVARS_IV23]]
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; CHECK-NEXT: [[LV:%.*]] = load i64, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[SUM_INC]] = add i64 [[SUM_INNER]], [[LV]]
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; CHECK-NEXT: [[IV_ORIGINAL:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[EXIT1_ORIGINAL:%.*]] = icmp eq i64 [[IV_ORIGINAL]], 100
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; CHECK-NEXT: br label [[FOR1_INC]]
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; CHECK: for2.split:
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; CHECK-NEXT: [[SUM_INC_LCSSA]] = phi i64 [ [[SUM_INC]], %for1.inc ]
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; CHECK-NEXT: [[INDVARS_IV_NEXT_3]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[EXIT1:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT_3]], 100
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; CHECK-NEXT: br i1 [[EXIT1]], label [[FOR1_LOOPEXIT:%.*]], label [[FOR2]]
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; CHECK: for1.inc:
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; CHECK-NEXT: [[INDVARS_IV_NEXT24]] = add nuw nsw i64 [[INDVARS_IV23]], 1
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; CHECK-NEXT: [[EXIT2:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT24]], 100
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; CHECK-NEXT: br i1 [[EXIT2]], label [[FOR2_SPLIT]], label [[FOR1_HEADER]]
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; CHECK: for1.loopexit:
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; CHECK-NEXT: [[SUM_INC_LCSSA2:%.*]] = phi i64 [ [[SUM_INC_LCSSA]], [[FOR2_SPLIT]] ]
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; CHECK-NEXT: ret i64 [[SUM_INC_LCSSA2]]
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;
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entry:
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br label %for1.header
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for1.header: ; preds = %for1.inc, %entry
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%indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc ]
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%sum.outer = phi i64 [ 0, %entry ], [ %sum.inc.lcssa, %for1.inc ]
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br label %for2
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for2: ; preds = %for2, %for1.header
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%indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next.3, %for2 ]
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%sum.inner = phi i64 [ %sum.outer, %for1.header ], [ %sum.inc, %for2 ]
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%arrayidx = getelementptr inbounds [100 x [100 x i64]], ptr %Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%lv = load i64, ptr %arrayidx, align 4
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%sum.inc = add i64 %sum.inner, %lv
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%indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 1
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%exit1 = icmp eq i64 %indvars.iv.next.3, 100
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br i1 %exit1, label %for1.inc, label %for2
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for1.inc: ; preds = %for2
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%sum.inc.lcssa = phi i64 [ %sum.inc, %for2 ]
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%exit2 = icmp eq i64 %indvars.iv.next24, 100
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br i1 %exit2, label %for1.loopexit, label %for1.header
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for1.loopexit: ; preds = %for1.inc
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%sum.inc.lcssa2 = phi i64 [ %sum.inc.lcssa, %for1.inc ]
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ret i64 %sum.inc.lcssa2
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}
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; In this test case, the inner reduction PHI %inner does not involve the outer
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; reduction PHI %sum.outer, do not interchange.
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test2
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Missed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: UnsupportedPHIOuter
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; REMARKS-NEXT: Function: test2
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define i64 @test2(ptr %Arr) {
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entry:
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br label %for1.header
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for1.header: ; preds = %for1.inc, %entry
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%indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc ]
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%sum.outer = phi i64 [ 0, %entry ], [ %sum.inc.lcssa, %for1.inc ]
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br label %for2
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for2: ; preds = %for2, %for1.header
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%indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next.3, %for2 ]
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%inner = phi i64 [ %indvars.iv23, %for1.header ], [ %sum.inc, %for2 ]
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%arrayidx = getelementptr inbounds [100 x [100 x i64]], ptr %Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%lv = load i64, ptr %arrayidx, align 4
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%sum.inc = add i64 %inner, %lv
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%indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 1
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%exit1 = icmp eq i64 %indvars.iv.next.3, 100
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br i1 %exit1, label %for1.inc, label %for2
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for1.inc: ; preds = %for2
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%sum.inc.lcssa = phi i64 [ %sum.inc, %for2 ]
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%exit2 = icmp eq i64 %indvars.iv.next24, 100
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br i1 %exit2, label %for1.loopexit, label %for1.header
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for1.loopexit: ; preds = %for1.inc
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%sum.inc.lcssa2 = phi i64 [ %sum.inc.lcssa, %for1.inc ]
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ret i64 %sum.inc.lcssa2
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}
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; Check that we do not interchange if there is an additional instruction
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; between the outer and inner reduction PHIs.
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test3
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Missed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: UnsupportedPHIOuter
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; REMARKS-NEXT: Function: test3
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define i64 @test3(ptr %Arr) {
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entry:
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br label %for1.header
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for1.header: ; preds = %for1.inc, %entry
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%indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc ]
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%sum.outer = phi i64 [ 0, %entry ], [ %sum.inc.lcssa, %for1.inc ]
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%so = add i64 %sum.outer, 10
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br label %for2
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for2: ; preds = %for2, %for1.header
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%indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next.3, %for2 ]
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%sum.inner = phi i64 [ %so, %for1.header ], [ %sum.inc, %for2 ]
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%arrayidx = getelementptr inbounds [100 x [100 x i64]], ptr %Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%lv = load i64, ptr %arrayidx, align 4
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%sum.inc = add i64 %sum.inner, %lv
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%indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 1
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%exit1 = icmp eq i64 %indvars.iv.next.3, 100
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br i1 %exit1, label %for1.inc, label %for2
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for1.inc: ; preds = %for2
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%sum.inc.lcssa = phi i64 [ %sum.inc, %for2 ]
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%exit2 = icmp eq i64 %indvars.iv.next24, 100
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br i1 %exit2, label %for1.loopexit, label %for1.header
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for1.loopexit: ; preds = %for1.inc
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%sum.inc.lcssa2 = phi i64 [ %sum.inc.lcssa, %for1.inc ]
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ret i64 %sum.inc.lcssa2
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}
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; Check that we do not interchange if reduction is stored in an invariant address inside inner loop
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test4
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Missed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test4
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define i64 @test4(ptr %Arr, ptr %dst) {
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entry:
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%gep.dst = getelementptr inbounds i64, ptr %dst, i64 42
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br label %for1.header
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for1.header: ; preds = %for1.inc, %entry
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%indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc ]
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%sum.outer = phi i64 [ 0, %entry ], [ %sum.inc.lcssa, %for1.inc ]
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br label %for2
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for2: ; preds = %for2, %for1.header
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%indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next.3, %for2 ]
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%sum.inner = phi i64 [ %sum.outer, %for1.header ], [ %sum.inc, %for2 ]
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%arrayidx = getelementptr inbounds [100 x [100 x i64]], ptr %Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%lv = load i64, ptr %arrayidx, align 4
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%sum.inc = add i64 %sum.inner, %lv
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store i64 %sum.inc, ptr %gep.dst, align 4
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%indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 1
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%exit1 = icmp eq i64 %indvars.iv.next.3, 100
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br i1 %exit1, label %for1.inc, label %for2
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for1.inc: ; preds = %for2
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%sum.inc.lcssa = phi i64 [ %sum.inc, %for2 ]
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%exit2 = icmp eq i64 %indvars.iv.next24, 100
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br i1 %exit2, label %for1.loopexit, label %for1.header
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for1.loopexit: ; preds = %for1.inc
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%sum.inc.lcssa2 = phi i64 [ %sum.inc.lcssa, %for1.inc ]
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ret i64 %sum.inc.lcssa2
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}
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; Check that we do not interchange or crash if the PHI in the outer loop gets a
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; constant from the inner loop.
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test_constant_inner_loop_res
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Missed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: UnsupportedPHIOuter
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; REMARKS-NEXT: Function: test_constant_inner_loop_res
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define i64 @test_constant_inner_loop_res(ptr %Arr) {
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entry:
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br label %for1.header
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for1.header: ; preds = %for1.inc, %entry
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%indvars.iv23 = phi i64 [ 0, %entry ], [ %indvars.iv.next24, %for1.inc ]
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%sum.outer = phi i64 [ 0, %entry ], [ %sum.inc.amend, %for1.inc ]
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br label %for2
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for2: ; preds = %for2, %for1.header
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%indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next.3, %for2 ]
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%sum.inner = phi i64 [ %sum.outer, %for1.header ], [ %sum.inc, %for2 ]
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%arrayidx = getelementptr inbounds [100 x [100 x i64]], ptr %Arr, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%lv = load i64, ptr %arrayidx, align 4
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%sum.inc = add i64 %sum.inner, %lv
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%indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 1
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%exit1 = icmp eq i64 %indvars.iv.next.3, 100
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br i1 %exit1, label %for1.inc, label %for2
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for1.inc: ; preds = %for2
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%sum.inc.lcssa = phi i64 [ %sum.inc, %for2 ]
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%const.lcssa = phi i64 [ 0, %for2 ]
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%sum.inc.amend = add i64 %const.lcssa, %sum.inc.lcssa
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%exit2 = icmp eq i64 %indvars.iv.next24, 100
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br i1 %exit2, label %for1.loopexit, label %for1.header
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for1.loopexit: ; preds = %for1.inc
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%il.res.lcssa2 = phi i64 [ %sum.inc.amend, %for1.inc ]
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ret i64 %il.res.lcssa2
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}
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; Floating point reductions are interchanged if all the fp instructions
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; involved allow reassociation.
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test5
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Passed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Interchanged
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; REMARKS-NEXT: Function: test5
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define float @test5(ptr %Arr, ptr %Arr2) {
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entry:
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br label %outer.header
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outer.header: ; preds = %outer.inc, %entry
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%iv.outer = phi i64 [ 1, %entry ], [ %iv.outer.next, %outer.inc ]
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%float.outer = phi float [ 1.000000e+00, %entry ], [ %float.inner.lcssa, %outer.inc ]
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br label %for.body3
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for.body3: ; preds = %for.body3, %outer.header
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%float.inner = phi float [ %float.outer , %outer.header ], [ %float.inner.inc.inc, %for.body3 ]
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x float]], ptr %Arr, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load float, ptr %arrayidx5
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%float.inner.inc = fadd fast float %float.inner, %vA
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%arrayidx6 = getelementptr inbounds [100 x [100 x float]], ptr %Arr2, i64 0, i64 %iv.inner, i64 %iv.outer
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%vB = load float, ptr %arrayidx6
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%float.inner.inc.inc = fadd fast float %float.inner.inc, %vB
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc: ; preds = %for.body3
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%float.inner.lcssa = phi float [ %float.inner.inc.inc, %for.body3 ]
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit: ; preds = %outer.inc
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%float.outer.lcssa = phi float [ %float.inner.lcssa, %outer.inc ]
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ret float %float.outer.lcssa
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}
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; Floating point reductions are not interchanged if not all the fp instructions
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; involved allow reassociation.
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; REMARKS: --- !Analysis
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: Dependence
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; REMARKS-NEXT: Function: test6
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; REMARKS-NEXT: Args:
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; REMARKS-NEXT: - String: Computed dependence info, invoking the transform.
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; REMARKS-NEXT: ...
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; REMARKS: --- !Missed
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; REMARKS-NEXT: Pass: loop-interchange
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; REMARKS-NEXT: Name: UnsupportedPHIOuter
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; REMARKS-NEXT: Function: test6
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define float @test6(ptr %Arr, ptr %Arr2) {
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entry:
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br label %outer.header
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outer.header: ; preds = %outer.inc, %entry
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%iv.outer = phi i64 [ 1, %entry ], [ %iv.outer.next, %outer.inc ]
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%float.outer = phi float [ 1.000000e+00, %entry ], [ %float.inner.lcssa, %outer.inc ]
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br label %for.body3
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for.body3: ; preds = %for.body3, %outer.header
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%float.inner = phi float [ %float.outer , %outer.header ], [ %float.inner.inc.inc, %for.body3 ]
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%iv.inner = phi i64 [ %iv.inner.next, %for.body3 ], [ 1, %outer.header ]
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%arrayidx5 = getelementptr inbounds [100 x [100 x float]], ptr %Arr, i64 0, i64 %iv.inner, i64 %iv.outer
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%vA = load float, ptr %arrayidx5
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%float.inner.inc = fadd float %float.inner, %vA ; do not allow reassociation
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%arrayidx6 = getelementptr inbounds [100 x [100 x float]], ptr %Arr2, i64 0, i64 %iv.inner, i64 %iv.outer
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%vB = load float, ptr %arrayidx6
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%float.inner.inc.inc = fadd fast float %float.inner.inc, %vB
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%iv.inner.next = add nuw nsw i64 %iv.inner, 1
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%exitcond = icmp eq i64 %iv.inner.next, 100
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br i1 %exitcond, label %outer.inc, label %for.body3
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outer.inc: ; preds = %for.body3
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%float.inner.lcssa = phi float [ %float.inner.inc.inc, %for.body3 ]
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%iv.outer.next = add nsw i64 %iv.outer, 1
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%cmp = icmp eq i64 %iv.outer.next, 100
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br i1 %cmp, label %outer.header, label %for.exit
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for.exit: ; preds = %outer.inc
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%float.outer.lcssa = phi float [ %float.inner.lcssa, %outer.inc ]
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ret float %float.outer.lcssa
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}
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