9a868a902c
This change allows sinking defs from loop preheader with PHI-use into loop body. Loop sink can now see through PHI-use and select incoming blocks of value being used as candidate sink destination. It makes loop sink more effective so more LICM can be undone if proven unprofitable with profile info. It addresses the motivating case in D87551, without resorting to profile guided LICM which breaks canonicalization. This is the 2nd attempt after D152772.
69 lines
2.5 KiB
LLVM
69 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -verify-memoryssa -passes=loop-sink < %s | FileCheck %s
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; Make sure that we handle PHI-uses correctly during loop sink if the most profitable sink
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; destination also has a PHI of another use.
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%struct.blam = type { %struct.blam.0, [32 x i8] }
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%struct.blam.0 = type { ptr, i64 }
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define internal void @wibble() !prof !0 {
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; CHECK-LABEL: define internal void @wibble
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; CHECK-SAME: () !prof [[PROF0:![0-9]+]] {
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br i1 false, label [[BB2:%.*]], label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: ret void
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; CHECK: bb3:
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; CHECK-NEXT: switch i32 0, label [[BB5:%.*]] [
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; CHECK-NEXT: i32 1, label [[BB4:%.*]]
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; CHECK-NEXT: i32 0, label [[BB1]]
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; CHECK-NEXT: ], !prof [[PROF1:![0-9]+]]
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; CHECK: bb4:
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; CHECK-NEXT: br i1 false, label [[BB3]], label [[BB6:%.*]]
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; CHECK: bb5:
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; CHECK-NEXT: [[GETELEMENTPTR:%.*]] = getelementptr [[STRUCT_BLAM:%.*]], ptr null, i64 0, i32 1
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; CHECK-NEXT: br i1 false, label [[BB6]], label [[BB7:%.*]]
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; CHECK: bb6:
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; CHECK-NEXT: br label [[BB7]]
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; CHECK: bb7:
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; CHECK-NEXT: [[PHI:%.*]] = phi ptr [ null, [[BB6]] ], [ [[GETELEMENTPTR]], [[BB5]] ]
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; CHECK-NEXT: [[GETELEMENTPTR1:%.*]] = getelementptr [[STRUCT_BLAM]], ptr null, i64 0, i32 1
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; CHECK-NEXT: store ptr [[GETELEMENTPTR1]], ptr null, align 8
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; CHECK-NEXT: br label [[BB1]]
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;
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bb:
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%getelementptr = getelementptr %struct.blam, ptr null, i64 0, i32 1
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br label %bb1
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bb1: ; preds = %bb7, %bb3, %bb
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br i1 false, label %bb2, label %bb3
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bb2: ; preds = %bb1
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ret void
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bb3: ; preds = %bb4, %bb1
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switch i32 0, label %bb5 [
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i32 1, label %bb4
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i32 0, label %bb1
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], !prof !1
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bb4: ; preds = %bb3
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br i1 false, label %bb3, label %bb6
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bb5: ; preds = %bb3
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br i1 false, label %bb6, label %bb7
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bb6: ; preds = %bb5, %bb4
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br label %bb7
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bb7: ; preds = %bb6, %bb5
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%phi = phi ptr [ null, %bb6 ], [ %getelementptr, %bb5 ]
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store ptr %getelementptr, ptr null, align 8
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br label %bb1
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}
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!0 = !{!"function_entry_count", i64 1}
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!1 = !{!"branch_weights", i32 1, i32 188894, i32 287400}
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