derek.holloway
7502bf64a4
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51 lines
1.5 KiB
LLVM
51 lines
1.5 KiB
LLVM
; RUN: llc -o - %s | FileCheck %s
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target triple = "arm-unknown-unknown"
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; select with and i1/or i1 condition should be implemented as a series of 2
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; cmovs, not by producing two conditions and using and on them.
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define i32 @select_and(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5) {
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; CHECK-LABEL: select_and
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; CHECK-NOT: tst
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; CHECK-NOT: movne
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; CHECK: mov{{lo|hs}}
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; CHECK: mov{{lo|hs}}
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%cmp0 = icmp ult i32 %a0, %a1
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%cmp1 = icmp ult i32 %a2, %a3
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%and = and i1 %cmp0, %cmp1
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%res = select i1 %and, i32 %a4, i32 %a5
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ret i32 %res
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}
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define i32 @select_or(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5) {
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; select with and i1 condition should be implemented as a series of 2 cmovs, not
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; by producing two conditions and using and on them.
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; CHECK-LABEL: select_or
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; CHECK-NOT: orss
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; CHECK-NOT: tst
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; CHECK: mov{{lo|hs}}
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; CHECK: mov{{lo|hs}}
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%cmp0 = icmp ult i32 %a0, %a1
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%cmp1 = icmp ult i32 %a2, %a3
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%and = or i1 %cmp0, %cmp1
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%res = select i1 %and, i32 %a4, i32 %a5
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ret i32 %res
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}
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; If one of the conditions is materialized as a 0/1 value anyway, then the
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; sequence of 2 cmovs should not be used.
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@var32 = global i32 0
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define i32 @select_noopt(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
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; CHECK-LABEL: select_noopt
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; CHECK: orrs
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; CHECK: movne
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%cmp0 = icmp ult i32 %a0, %a1
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%cmp1 = icmp ult i32 %a1, %a2
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%or = or i1 %cmp0, %cmp1
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%zero_one = zext i1 %or to i32
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store volatile i32 %zero_one, ptr @var32
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%res = select i1 %or, i32 %a3, i32 %a4
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ret i32 %res
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}
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