rev.ll
1.78 KB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=thumb-eabi -mattr=+v6 %s -o - | FileCheck %s
define i32 @test1(i32 %X) nounwind {
; CHECK-LABEL: test1:
; CHECK: @ %bb.0:
; CHECK-NEXT: rev16 r0, r0
; CHECK-NEXT: bx lr
%tmp1 = lshr i32 %X, 8
%X15 = bitcast i32 %X to i32
%tmp4 = shl i32 %X15, 8
%tmp2 = and i32 %tmp1, 16711680
%tmp5 = and i32 %tmp4, -16777216
%tmp9 = and i32 %tmp1, 255
%tmp13 = and i32 %tmp4, 65280
%tmp6 = or i32 %tmp5, %tmp2
%tmp10 = or i32 %tmp6, %tmp13
%tmp14 = or i32 %tmp10, %tmp9
ret i32 %tmp14
}
define i32 @test2(i32 %X) nounwind {
; CHECK-LABEL: test2:
; CHECK: @ %bb.0:
; CHECK-NEXT: revsh r0, r0
; CHECK-NEXT: bx lr
%tmp1 = lshr i32 %X, 8
%tmp1.upgrd.1 = trunc i32 %tmp1 to i16
%tmp3 = trunc i32 %X to i16
%tmp2 = and i16 %tmp1.upgrd.1, 255
%tmp4 = shl i16 %tmp3, 8
%tmp5 = or i16 %tmp2, %tmp4
%tmp5.upgrd.2 = sext i16 %tmp5 to i32
ret i32 %tmp5.upgrd.2
}
; rdar://9147637
define i32 @test3(i16 zeroext %a) nounwind {
; CHECK-LABEL: test3:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: revsh r0, r0
; CHECK-NEXT: bx lr
entry:
%0 = tail call i16 @llvm.bswap.i16(i16 %a)
%1 = sext i16 %0 to i32
ret i32 %1
}
declare i16 @llvm.bswap.i16(i16) nounwind readnone
define i32 @test4(i16 zeroext %a) nounwind {
; CHECK-LABEL: test4:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: revsh r0, r0
; CHECK-NEXT: bx lr
entry:
%conv = zext i16 %a to i32
%shr9 = lshr i16 %a, 8
%conv2 = zext i16 %shr9 to i32
%shl = shl nuw nsw i32 %conv, 8
%or = or i32 %conv2, %shl
%sext = shl i32 %or, 16
%conv8 = ashr exact i32 %sext, 16
ret i32 %conv8
}