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[AArch64] Add regression test for missed bfi optimization.

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(See https://reviews.llvm.org/D60358 for the transform that breaks this
case.)
This commit is contained in:
Eli Friedman 2021-06-02 17:23:58 -07:00
parent f976b9997e
commit d8b9ed72ee
1 changed files with 15 additions and 0 deletions
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15
llvm/test/CodeGen/AArch64/bitfield-insert.ll
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@ -576,3 +576,18 @@ define <2 x i32> @test_complex_type(<2 x i32>* %addr, i64 %in, i64* %bf ) {
ret <2 x i32> %vec
}
define i64 @test_truncated_shift(i64 %x, i64 %y) {
; CHECK-LABEL: test_truncated_shift:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: lsl w8, w1, #25
; CHECK-NEXT: lsr x8, x8, #25
; CHECK-NEXT: bfi x0, x8, #25, #5
; CHECK-NEXT: ret
entry:
%and = and i64 %x, -1040187393
%shl4 = shl i64 %y, 25
%and5 = and i64 %shl4, 1040187392
%or = or i64 %and5, %and
ret i64 %or
}