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
46 lines
1.3 KiB
LLVM
46 lines
1.3 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 @may_unwind()
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define i1 @test_switch_in_block_with_assume(i32 %x) {
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; CHECK-LABEL: @test_switch_in_block_with_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @may_unwind()
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; CHECK-NEXT: [[C_1:%.*]] = icmp ult i32 [[X:%.*]], 10
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; CHECK-NEXT: call void @llvm.assume(i1 [[C_1]])
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; CHECK-NEXT: switch i32 0, label [[EXIT_1:%.*]] [
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; CHECK-NEXT: i32 1, label [[EXIT_2:%.*]]
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; CHECK-NEXT: ]
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; CHECK: exit.1:
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; CHECK-NEXT: [[C_2:%.*]] = icmp ult i32 [[X]], 9
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; CHECK-NEXT: [[RES_1:%.*]] = xor i1 true, [[C_2]]
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; CHECK-NEXT: ret i1 [[RES_1]]
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; CHECK: exit.2:
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; CHECK-NEXT: [[C_3:%.*]] = icmp ult i32 [[X]], 9
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; CHECK-NEXT: [[RES_2:%.*]] = xor i1 true, [[C_3]]
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; CHECK-NEXT: ret i1 [[RES_2]]
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;
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entry:
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call void @may_unwind()
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%c.1 = icmp ult i32 %x, 10
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call void @llvm.assume(i1 %c.1)
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switch i32 0, label %exit.1 [
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i32 1, label %exit.2
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]
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exit.1:
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%t.1 = icmp ult i32 %x, 10
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%c.2 = icmp ult i32 %x, 9
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%res.1 = xor i1 %t.1, %c.2
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ret i1 %res.1
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exit.2:
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%t.2 = icmp ult i32 %x, 10
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%c.3 = icmp ult i32 %x, 9
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%res.2 = xor i1 %t.2, %c.3
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ret i1 %res.2
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}
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declare void @llvm.assume(i1)
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