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Follow up on r127913. Fix Thumb revsh isel. rdar://9286766 

llvm-svn: 129548
This commit is contained in:
Evan Cheng 2011-04-14 23:27:44 +00:00
parent 6ca6410e3a
commit 44887f9c7e
2 changed files with 65 additions and 1 deletions
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10
llvm/lib/Target/ARM/ARMInstrThumb.td
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@ -1184,10 +1184,18 @@ def tREVSH : // A8.6.136
"revsh", "\t$Rd, $Rm",
[(set tGPR:$Rd,
(sext_inreg
(or (srl (and tGPR:$Rm, 0xFF00), (i32 8)),
(or (srl tGPR:$Rm, (i32 8)),
(shl tGPR:$Rm, (i32 8))), i16))]>,
Requires<[IsThumb, IsThumb1Only, HasV6]>;
def : T1Pat<(sext_inreg (or (srl (and tGPR:$Rm, 0xFF00), (i32 8)),
(shl tGPR:$Rm, (i32 8))), i16),
(tREVSH tGPR:$Rm)>,
Requires<[IsThumb, IsThumb1Only, HasV6]>;
def : T1Pat<(sra (bswap tGPR:$Rm), (i32 16)), (tREVSH tGPR:$Rm)>,
Requires<[IsThumb, IsThumb1Only, HasV6]>;
// Rotate right register
def tROR : // A8.6.139
T1sItDPEncode<0b0111, (outs tGPR:$Rdn), (ins tGPR:$Rn, tGPR:$Rm),

56
llvm/test/CodeGen/Thumb/rev.ll Normal file
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@ -0,0 +1,56 @@
; RUN: llc < %s -march=thumb -mattr=+v6 | FileCheck %s
define i32 @test1(i32 %X) nounwind {
; CHECK: test1
; CHECK: rev16 r0, r0
%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: test2
; CHECK: revsh r0, r0
%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 {
entry:
; CHECK: test3:
; CHECK: revsh r0, r0
%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 {
entry:
; CHECK: test4:
; CHECK: revsh r0, r0
%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
}