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[InstCombine] add tests for vector insert/extract; NFC

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Preliminary step for D52439.

llvm-svn: 343128
This commit is contained in:
Sanjay Patel 2018-09-26 17:57:38 +00:00
parent 8f7099c560
commit 1df524b370
1 changed files with 46 additions and 0 deletions
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46
test/Transforms/InstCombine/extractelement.ll
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@ -93,3 +93,49 @@ define i8 @bitcasted_inselt_wide_source_not_modulo_elt_not_half(i32 %x) {
ret i8 %r
}
define i3 @bitcasted_inselt_wide_source_not_modulo_elt_not_half_weird_types(i15 %x) {
; ANY-LABEL: @bitcasted_inselt_wide_source_not_modulo_elt_not_half_weird_types(
; ANY-NEXT: [[I:%.*]] = insertelement <3 x i15> undef, i15 [[X:%.*]], i32 0
; ANY-NEXT: [[B:%.*]] = bitcast <3 x i15> [[I]] to <15 x i3>
; ANY-NEXT: [[R:%.*]] = extractelement <15 x i3> [[B]], i32 1
; ANY-NEXT: ret i3 [[R]]
;
%i = insertelement <3 x i15> undef, i15 %x, i32 0
%b = bitcast <3 x i15> %i to <15 x i3>
%r = extractelement <15 x i3> %b, i32 1
ret i3 %r
}
; Negative test for the above fold, but we can remove the insert here.
define i8 @bitcasted_inselt_wide_source_wrong_insert(<2 x i32> %v, i32 %x) {
; ANY-LABEL: @bitcasted_inselt_wide_source_wrong_insert(
; ANY-NEXT: [[B:%.*]] = bitcast <2 x i32> [[V:%.*]] to <8 x i8>
; ANY-NEXT: [[R:%.*]] = extractelement <8 x i8> [[B]], i32 2
; ANY-NEXT: ret i8 [[R]]
;
%i = insertelement <2 x i32> %v, i32 %x, i32 1
%b = bitcast <2 x i32> %i to <8 x i8>
%r = extractelement <8 x i8> %b, i32 2
ret i8 %r
}
; Partial negative test for the above fold, extra uses are not allowed if shift is needed.
declare void @use(<8 x i8>)
define i8 @bitcasted_inselt_wide_source_uses(i32 %x) {
; ANY-LABEL: @bitcasted_inselt_wide_source_uses(
; ANY-NEXT: [[I:%.*]] = insertelement <2 x i32> undef, i32 [[X:%.*]], i32 0
; ANY-NEXT: [[B:%.*]] = bitcast <2 x i32> [[I]] to <8 x i8>
; ANY-NEXT: call void @use(<8 x i8> [[B]])
; ANY-NEXT: [[R:%.*]] = extractelement <8 x i8> [[B]], i32 3
; ANY-NEXT: ret i8 [[R]]
;
%i = insertelement <2 x i32> undef, i32 %x, i32 0
%b = bitcast <2 x i32> %i to <8 x i8>
call void @use(<8 x i8> %b)
%r = extractelement <8 x i8> %b, i32 3
ret i8 %r
}