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[InstCombine] Add bswap test pattern using truncates

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This commit is contained in:
Simon Pilgrim 2020-10-26 16:11:03 +00:00
parent d6a0957467
commit 0ef6a25e19
1 changed files with 33 additions and 0 deletions
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33
llvm/test/Transforms/InstCombine/bswap.ll
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@ -594,6 +594,39 @@ define i64 @bswap_and_mask_2(i64 %0) {
ret i64 %7
}
define i64 @bswap_trunc(i64 %x01234567) {
; CHECK-LABEL: @bswap_trunc(
; CHECK-NEXT: [[X7ZZZZZZZ:%.*]] = shl i64 [[X01234567:%.*]], 56
; CHECK-NEXT: [[XZ0123456:%.*]] = lshr i64 [[X01234567]], 8
; CHECK-NEXT: [[XZZZZZ012:%.*]] = lshr i64 [[X01234567]], 40
; CHECK-NEXT: [[X3456:%.*]] = trunc i64 [[XZ0123456]] to i32
; CHECK-NEXT: [[XZ012:%.*]] = trunc i64 [[XZZZZZ012]] to i32
; CHECK-NEXT: [[X6543:%.*]] = call i32 @llvm.bswap.i32(i32 [[X3456]])
; CHECK-NEXT: [[X210Z:%.*]] = call i32 @llvm.bswap.i32(i32 [[XZ012]])
; CHECK-NEXT: [[XZ210:%.*]] = lshr exact i32 [[X210Z]], 8
; CHECK-NEXT: [[XZZZZ6543:%.*]] = zext i32 [[X6543]] to i64
; CHECK-NEXT: [[XZZZZZ210:%.*]] = zext i32 [[XZ210]] to i64
; CHECK-NEXT: [[XZ6543ZZZ:%.*]] = shl nuw nsw i64 [[XZZZZ6543]], 24
; CHECK-NEXT: [[XZ6543210:%.*]] = or i64 [[XZ6543ZZZ]], [[XZZZZZ210]]
; CHECK-NEXT: [[X76543210:%.*]] = or i64 [[XZ6543210]], [[X7ZZZZZZZ]]
; CHECK-NEXT: ret i64 [[X76543210]]
;
%x7zzzzzzz = shl i64 %x01234567, 56
%xz0123456 = lshr i64 %x01234567, 8
%xzzzzz012 = lshr i64 %x01234567, 40
%x3456 = trunc i64 %xz0123456 to i32
%xz012 = trunc i64 %xzzzzz012 to i32
%x6543 = call i32 @llvm.bswap.i32(i32 %x3456)
%x210z = call i32 @llvm.bswap.i32(i32 %xz012)
%xz210 = lshr i32 %x210z, 8
%xzzzz6543 = zext i32 %x6543 to i64
%xzzzzz210 = zext i32 %xz210 to i64
%xz6543zzz = shl i64 %xzzzz6543, 24
%xz6543210 = or i64 %xzzzzz210, %xz6543zzz
%x76543210 = or i64 %xz6543210, %x7zzzzzzz
ret i64 %x76543210
}
define i32 @shuf_4bytes(<4 x i8> %x) {
; CHECK-LABEL: @shuf_4bytes(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x i8> [[X:%.*]] to i32