derek.holloway
7502bf64a4
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47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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define void @redundant_add(i64 %n) {
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; Check that we don't create two additions for the sadd.with.overflow.
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; CHECK-LABEL: redundant_add:
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; CHECK: ## %bb.0: ## %entry
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: LBB0_1: ## %exit_check
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; CHECK-NEXT: ## =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: cmpq %rdi, %rax
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; CHECK-NEXT: jge LBB0_4
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; CHECK-NEXT: ## %bb.2: ## %loop
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; CHECK-NEXT: ## in Loop: Header=BB0_1 Depth=1
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; CHECK-NEXT: incq %rax
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; CHECK-NEXT: jno LBB0_1
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; CHECK-NEXT: ## %bb.3: ## %overflow
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; CHECK-NEXT: ud2
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; CHECK-NEXT: LBB0_4: ## %exit
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; CHECK-NEXT: retq
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entry:
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br label %exit_check
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exit_check:
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%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
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%c = icmp slt i64 %i, %n
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br i1 %c, label %loop, label %exit
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loop:
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%i.o = tail call { i64, i1 } @llvm.sadd.with.overflow.i64(i64 %i, i64 1)
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%i.next = extractvalue { i64, i1 } %i.o, 0
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%o = extractvalue { i64, i1 } %i.o, 1
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br i1 %o, label %overflow, label %exit_check
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exit:
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ret void
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overflow:
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tail call void @llvm.trap()
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unreachable
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}
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declare { i64, i1 } @llvm.sadd.with.overflow.i64(i64, i64)
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declare void @llvm.trap()
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