120c059292
Port partial constant store merging logic to MemorySSA backed DSE. The heavy lifting is done by the existing helper function. It is used in context where we already ensured that the later instruction can eliminate the earlier one, if it is a complete overwrite.
165 lines
4.4 KiB
LLVM
165 lines
4.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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define void @second_store_smaller_1(i32* noalias %P, i1 %c) {
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; CHECK-LABEL: @second_store_smaller_1(
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; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%P.i16 = bitcast i32* %P to i16*
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store i16 0, i16* %P.i16
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ret void
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}
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define void @second_store_smaller_2(i32* noalias %P, i1 %c) {
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; CHECK-LABEL: @second_store_smaller_2(
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; CHECK-NEXT: store i32 12345, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%P.i16 = bitcast i32* %P to i16*
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store i16 12345, i16* %P.i16
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ret void
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}
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declare void @use(i16) readnone
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declare void @use.i8(i8) readnone
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define void @second_store_smaller_3(i32* noalias %P, i1 %c) {
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; CHECK-LABEL: @second_store_smaller_3(
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[P_I16:%.*]] = bitcast i32* [[P]] to i16*
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[L1:%.*]] = load i16, i16* [[P_I16]], align 2
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; CHECK-NEXT: call void @use(i16 [[L1]])
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: store i16 -31073, i16* [[P_I16]], align 2
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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%P.i16 = bitcast i32* %P to i16*
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br i1 %c, label %bb1, label %bb2
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bb1:
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%l1 = load i16, i16* %P.i16
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call void @use(i16 %l1)
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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store i16 -31073, i16* %P.i16
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ret void
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}
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define void @second_store_smaller_4(i32* noalias %P, i1 %c) {
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; CHECK-LABEL: @second_store_smaller_4(
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[P_I8:%.*]] = bitcast i32* [[P]] to i8*
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; CHECK-NEXT: [[L1:%.*]] = load i8, i8* [[P_I8]], align 1
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; CHECK-NEXT: call void @use.i8(i8 [[L1]])
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P_I16:%.*]] = bitcast i32* [[P]] to i16*
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; CHECK-NEXT: store i16 -31073, i16* [[P_I16]], align 2
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c, label %bb1, label %bb2
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bb1:
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%P.i8 = bitcast i32* %P to i8*
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%l1 = load i8, i8* %P.i8
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call void @use.i8(i8 %l1)
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%P.i16 = bitcast i32* %P to i16*
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store i16 -31073, i16* %P.i16
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ret void
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}
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define void @second_store_smaller_5(i32* noalias %P, i16 %x, i1 %c) {
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; CHECK-LABEL: @second_store_smaller_5(
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; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P_I16:%.*]] = bitcast i32* [[P]] to i16*
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; CHECK-NEXT: store i16 [[X:%.*]], i16* [[P_I16]], align 2
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%P.i16 = bitcast i32* %P to i16*
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store i16 %x, i16* %P.i16
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ret void
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}
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define void @second_store_bigger(i32* noalias %P, i1 %c) {
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; CHECK-LABEL: @second_store_bigger(
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; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: br label [[BB3]]
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; CHECK: bb3:
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; CHECK-NEXT: [[P_I64:%.*]] = bitcast i32* [[P:%.*]] to i64*
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; CHECK-NEXT: store i64 0, i64* [[P_I64]], align 8
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; CHECK-NEXT: ret void
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;
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store i32 1, i32* %P
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br i1 %c, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%P.i64 = bitcast i32* %P to i64*
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store i64 0, i64* %P.i64
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ret void
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}
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