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424da54881
Summary:
The byte-swap recognizer can now notice that this
```
uint32_t bswap(uint32_t x)
{
x = (x & 0x0000FFFF) << 16 | (x & 0xFFFF0000) >> 16;
x = (x & 0x00FF00FF) << 8 | (x & 0xFF00FF00) >> 8;
return x;
}
```
is a bswap. Fixes PR23863.
Reviewers: nlewycky, hfinkel, hans, jmolloy, rengolin
Subscribers: majnemer, rengolin, llvm-commits
Differential Revision: http://reviews.llvm.org/D12637
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248482 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.9 KiB
LLVM
87 lines
2.9 KiB
LLVM
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
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; RUN: opt < %s -instcombine -S | \
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; RUN: grep "call.*llvm.bswap" | count 7
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define i32 @test1(i32 %i) {
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%tmp1 = lshr i32 %i, 24 ; <i32> [#uses=1]
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%tmp3 = lshr i32 %i, 8 ; <i32> [#uses=1]
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%tmp4 = and i32 %tmp3, 65280 ; <i32> [#uses=1]
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%tmp5 = or i32 %tmp1, %tmp4 ; <i32> [#uses=1]
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%tmp7 = shl i32 %i, 8 ; <i32> [#uses=1]
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%tmp8 = and i32 %tmp7, 16711680 ; <i32> [#uses=1]
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%tmp9 = or i32 %tmp5, %tmp8 ; <i32> [#uses=1]
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%tmp11 = shl i32 %i, 24 ; <i32> [#uses=1]
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%tmp12 = or i32 %tmp9, %tmp11 ; <i32> [#uses=1]
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ret i32 %tmp12
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}
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define i32 @test2(i32 %arg) {
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%tmp2 = shl i32 %arg, 24 ; <i32> [#uses=1]
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%tmp4 = shl i32 %arg, 8 ; <i32> [#uses=1]
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%tmp5 = and i32 %tmp4, 16711680 ; <i32> [#uses=1]
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%tmp6 = or i32 %tmp2, %tmp5 ; <i32> [#uses=1]
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%tmp8 = lshr i32 %arg, 8 ; <i32> [#uses=1]
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%tmp9 = and i32 %tmp8, 65280 ; <i32> [#uses=1]
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%tmp10 = or i32 %tmp6, %tmp9 ; <i32> [#uses=1]
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%tmp12 = lshr i32 %arg, 24 ; <i32> [#uses=1]
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%tmp14 = or i32 %tmp10, %tmp12 ; <i32> [#uses=1]
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ret i32 %tmp14
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}
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define i16 @test3(i16 %s) {
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%tmp2 = lshr i16 %s, 8 ; <i16> [#uses=1]
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%tmp4 = shl i16 %s, 8 ; <i16> [#uses=1]
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%tmp5 = or i16 %tmp2, %tmp4 ; <i16> [#uses=1]
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ret i16 %tmp5
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}
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define i16 @test4(i16 %s) {
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%tmp2 = lshr i16 %s, 8 ; <i16> [#uses=1]
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%tmp4 = shl i16 %s, 8 ; <i16> [#uses=1]
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%tmp5 = or i16 %tmp4, %tmp2 ; <i16> [#uses=1]
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ret i16 %tmp5
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}
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define i16 @test5(i16 %a) {
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%tmp = zext i16 %a to i32 ; <i32> [#uses=2]
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%tmp1 = and i32 %tmp, 65280 ; <i32> [#uses=1]
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%tmp2 = ashr i32 %tmp1, 8 ; <i32> [#uses=1]
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%tmp2.upgrd.1 = trunc i32 %tmp2 to i16 ; <i16> [#uses=1]
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%tmp4 = and i32 %tmp, 255 ; <i32> [#uses=1]
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%tmp5 = shl i32 %tmp4, 8 ; <i32> [#uses=1]
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%tmp5.upgrd.2 = trunc i32 %tmp5 to i16 ; <i16> [#uses=1]
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%tmp.upgrd.3 = or i16 %tmp2.upgrd.1, %tmp5.upgrd.2 ; <i16> [#uses=1]
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%tmp6 = bitcast i16 %tmp.upgrd.3 to i16 ; <i16> [#uses=1]
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%tmp6.upgrd.4 = zext i16 %tmp6 to i32 ; <i32> [#uses=1]
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%retval = trunc i32 %tmp6.upgrd.4 to i16 ; <i16> [#uses=1]
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ret i16 %retval
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}
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; PR2842
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define i32 @test6(i32 %x) nounwind readnone {
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%tmp = shl i32 %x, 16 ; <i32> [#uses=1]
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%x.mask = and i32 %x, 65280 ; <i32> [#uses=1]
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%tmp1 = lshr i32 %x, 16 ; <i32> [#uses=1]
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%tmp2 = and i32 %tmp1, 255 ; <i32> [#uses=1]
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%tmp3 = or i32 %x.mask, %tmp ; <i32> [#uses=1]
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%tmp4 = or i32 %tmp3, %tmp2 ; <i32> [#uses=1]
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%tmp5 = shl i32 %tmp4, 8 ; <i32> [#uses=1]
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%tmp6 = lshr i32 %x, 24 ; <i32> [#uses=1]
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%tmp7 = or i32 %tmp5, %tmp6 ; <i32> [#uses=1]
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ret i32 %tmp7
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}
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; PR23863
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define i32 @test7(i32 %x) {
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%shl = shl i32 %x, 16
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%shr = lshr i32 %x, 16
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%or = or i32 %shl, %shr
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%and2 = shl i32 %or, 8
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%shl3 = and i32 %and2, -16711936
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%and4 = lshr i32 %or, 8
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%shr5 = and i32 %and4, 16711935
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%or6 = or i32 %shl3, %shr5
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ret i32 %or6
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}
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