derek.holloway
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44 lines
1.1 KiB
LLVM
44 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-darwin -mcpu=generic | FileCheck %s
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; XFAIL: *
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; rdar:15661073 simple example of redundant adds
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;
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; MachineCSE should coalesce trivial subregister copies.
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;
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; The extra movl+addl should be removed during MachineCSE.
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; CHECK-LABEL: redundantadd
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; CHECK: cmpq
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; CHECK: movq
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; CHECK-NOT: movl
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; CHECK: addl
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; CHECK-NOT: addl
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; CHECK: ret
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define i64 @redundantadd(ptr %a0, ptr %a1) {
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entry:
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%tmp8 = load i64, ptr %a0, align 8
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%tmp12 = load i64, ptr %a1, align 8
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%tmp13 = icmp ult i64 %tmp12, -281474976710656
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br i1 %tmp13, label %exit1, label %body
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exit1:
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unreachable
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body:
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%tmp14 = trunc i64 %tmp8 to i32
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%tmp15 = trunc i64 %tmp12 to i32
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%tmp16 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %tmp14, i32 %tmp15)
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%tmp17 = extractvalue { i32, i1 } %tmp16, 1
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br i1 %tmp17, label %exit2, label %return
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exit2:
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unreachable
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return:
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%tmp18 = add i64 %tmp12, %tmp8
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%tmp19 = and i64 %tmp18, 4294967295
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%tmp20 = or i64 %tmp19, -281474976710656
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ret i64 %tmp20
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}
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declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)
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