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Generate CMN when comparing a short int with minus

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216651 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Xu
2014-08-28 04:59:53 +00:00
parent cf3736085b
commit 5ca793561e
2 changed files with 87 additions and 3 deletions
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46
test/CodeGen/AArch64/cmpwithshort.ll Normal file
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@@ -0,0 +1,46 @@
; RUN: llc -O3 -march=aarch64 < %s | FileCheck %s
define i16 @test_1cmp_signed_1(i16* %ptr1) {
; CHECK-LABLE: @test_1cmp_signed_1
; CHECK: ldrsh
; CHECK-NEXT: cmn
entry:
%addr = getelementptr inbounds i16* %ptr1, i16 0
%val = load i16* %addr, align 2
%cmp = icmp eq i16 %val, -1
br i1 %cmp, label %if, label %if.then
if:
ret i16 1
if.then:
ret i16 0
}
define i16 @test_1cmp_signed_2(i16* %ptr1) {
; CHECK-LABLE: @test_1cmp_signed_2
; CHECK: ldrsh
; CHECK-NEXT: cmn
entry:
%addr = getelementptr inbounds i16* %ptr1, i16 0
%val = load i16* %addr, align 2
%cmp = icmp sge i16 %val, -1
br i1 %cmp, label %if, label %if.then
if:
ret i16 1
if.then:
ret i16 0
}
define i16 @test_1cmp_unsigned_1(i16* %ptr1) {
; CHECK-LABLE: @test_1cmp_unsigned_1
; CHECK: ldrsh
; CHECK-NEXT: cmn
entry:
%addr = getelementptr inbounds i16* %ptr1, i16 0
%val = load i16* %addr, align 2
%cmp = icmp uge i16 %val, -1
br i1 %cmp, label %if, label %if.then
if:
ret i16 1
if.then:
ret i16 0
}