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[NFC][InstCombine] Negator: tests for extractelement negation

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Roman Lebedev 2020-05-20 20:54:06 +03:00
parent 9f19cc8cac
commit 952e7106b3
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1 changed files with 33 additions and 0 deletions
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33
llvm/test/Transforms/InstCombine/sub-of-negatible.ll
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@ -1,6 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -instcombine -S | FileCheck %s
declare void @use4(i4)
declare void @use8(i8)
declare void @use_v2i4(<2 x i4>)
@ -914,3 +915,35 @@ define i8 @add_via_or_with_no_common_bits_set_extrause(i8 %x, i8 %y) {
%t3 = sub i8 %x, %t2
ret i8 %t3
}
; `extractelement` is negatible if source operand is negatible.
define i4 @negate_extractelement(<2 x i4> %x, i32 %y, i4 %z) {
; CHECK-LABEL: @negate_extractelement(
; CHECK-NEXT: [[T0:%.*]] = sub <2 x i4> zeroinitializer, [[X:%.*]]
; CHECK-NEXT: call void @use_v2i4(<2 x i4> [[T0]])
; CHECK-NEXT: [[T1:%.*]] = extractelement <2 x i4> [[T0]], i32 [[Y:%.*]]
; CHECK-NEXT: [[T2:%.*]] = sub i4 [[Z:%.*]], [[T1]]
; CHECK-NEXT: ret i4 [[T2]]
;
%t0 = sub <2 x i4> zeroinitializer, %x
call void @use_v2i4(<2 x i4> %t0)
%t1 = extractelement <2 x i4> %t0, i32 %y
%t2 = sub i4 %z, %t1
ret i4 %t2
}
define i4 @negate_extractelement_extrause(<2 x i4> %x, i32 %y, i4 %z) {
; CHECK-LABEL: @negate_extractelement_extrause(
; CHECK-NEXT: [[T0:%.*]] = sub <2 x i4> zeroinitializer, [[X:%.*]]
; CHECK-NEXT: call void @use_v2i4(<2 x i4> [[T0]])
; CHECK-NEXT: [[T1:%.*]] = extractelement <2 x i4> [[T0]], i32 [[Y:%.*]]
; CHECK-NEXT: call void @use4(i4 [[T1]])
; CHECK-NEXT: [[T2:%.*]] = sub i4 [[Z:%.*]], [[T1]]
; CHECK-NEXT: ret i4 [[T2]]
;
%t0 = sub <2 x i4> zeroinitializer, %x
call void @use_v2i4(<2 x i4> %t0)
%t1 = extractelement <2 x i4> %t0, i32 %y
call void @use4(i4 %t1)
%t2 = sub i4 %z, %t1
ret i4 %t2
}