13ffde316a
Remove compares after replacing all uses. Cleaning dead compares can enable additional simplifications when adjusting the position of the pass slightly. In particular, it seems like the additional dead instructions may prevent SimplifyCFG performing some folds. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D158760
68 lines
2.2 KiB
LLVM
68 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
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declare void @use(i1)
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; Make sure we do not crash when trying to inject info about vector values from SCEV.
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define void @test_vector_iv(i32 %x, i1 %c) {
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; CHECK-LABEL: @test_vector_iv(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[PRE:%.*]], label [[BB2:%.*]]
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; CHECK: pre:
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; CHECK-NEXT: [[C_1:%.*]] = icmp ule i32 [[X:%.*]], 10
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; CHECK-NEXT: br i1 [[C_1]], label [[LOOP:%.*]], label [[BB2]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi <4 x i8> [ zeroinitializer, [[PRE]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: call void @use(i1 false)
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; CHECK-NEXT: [[C_2:%.*]] = icmp ule i32 [[X]], 9
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; CHECK-NEXT: call void @use(i1 [[C_2]])
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; CHECK-NEXT: [[C_3:%.*]] = icmp ugt i32 [[X]], 9
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; CHECK-NEXT: call void @use(i1 [[C_3]])
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw <4 x i8> [[IV]], <i8 1, i8 1, i8 1, i8 1>
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; CHECK-NEXT: [[E:%.*]] = extractelement <4 x i8> [[IV_NEXT]], i8 2
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; CHECK-NEXT: [[EC:%.*]] = icmp eq i8 [[E]], 100
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; CHECK-NEXT: br i1 [[EC]], label [[EXIT:%.*]], label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: ret void
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; CHECK: bb2:
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; CHECK-NEXT: [[C_5:%.*]] = icmp ugt i32 [[X]], 10
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; CHECK-NEXT: call void @use(i1 [[C_5]])
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; CHECK-NEXT: ret void
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;
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entry:
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br i1 %c, label %pre, label %bb2
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pre:
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%c.1 = icmp ule i32 %x, 10
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br i1 %c.1, label %loop, label %bb2
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loop:
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%iv = phi <4 x i8> [ zeroinitializer, %pre ], [ %iv.next, %loop ]
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%t.1 = icmp ule i32 %x, 10
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call void @use(i1 %t.1)
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%f.1 = icmp ugt i32 %x, 10
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call void @use(i1 %f.1)
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%c.2 = icmp ule i32 %x, 9
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call void @use(i1 %c.2)
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%c.3 = icmp ugt i32 %x, 9
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call void @use(i1 %c.3)
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%iv.next = add nuw nsw <4 x i8> %iv, <i8 1, i8 1, i8 1, i8 1>
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%e = extractelement <4 x i8> %iv.next, i8 2
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%ec = icmp eq i8 %e, 100
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br i1 %ec, label %exit, label %loop
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exit:
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%c.4 = icmp ule i32 %x, 10
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call void @use(i1 %c.4)
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ret void
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bb2:
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%c.5 = icmp ugt i32 %x, 10
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call void @use(i1 %c.5)
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ret void
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}
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