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d1d88e8e3a
Similar in spirit to D20497 : If all elements of a constant vector are known non-zero, then we can say that the whole vector is known non-zero. It seems like we could extend this to FP scalar/vector too, but isKnownNonZero() says it only works for integers and pointers for now. Differential Revision: http://reviews.llvm.org/D20544 llvm-svn: 270562
66 lines
2.0 KiB
LLVM
66 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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define <2 x i1> @nonzero_vec_splat(<2 x i32> %x) {
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; CHECK-LABEL: @nonzero_vec_splat(
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; CHECK-NEXT: ret <2 x i1> zeroinitializer
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;
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%y = or <2 x i32> %x, <i32 1, i32 1>
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%c = icmp eq <2 x i32> %y, zeroinitializer
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ret <2 x i1> %c
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}
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define <2 x i1> @nonzero_vec_nonsplat(<2 x i32> %x) {
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; CHECK-LABEL: @nonzero_vec_nonsplat(
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; CHECK-NEXT: ret <2 x i1> <i1 true, i1 true>
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;
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%y = or <2 x i32> %x, <i32 2, i32 1>
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%c = icmp ne <2 x i32> %y, zeroinitializer
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ret <2 x i1> %c
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}
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define <2 x i1> @nonzero_vec_undef_elt(<2 x i32> %x) {
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; CHECK-LABEL: @nonzero_vec_undef_elt(
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; CHECK-NEXT: ret <2 x i1> zeroinitializer
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;
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%y = or <2 x i32> %x, <i32 undef, i32 1>
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%c = icmp eq <2 x i32> %y, zeroinitializer
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ret <2 x i1> %c
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}
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define <2 x i1> @may_be_zero_vec(<2 x i32> %x) {
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; CHECK-LABEL: @may_be_zero_vec(
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; CHECK-NEXT: [[Y:%.*]] = or <2 x i32> %x, <i32 0, i32 1>
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; CHECK-NEXT: [[C:%.*]] = icmp ne <2 x i32> [[Y]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[C]]
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;
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%y = or <2 x i32> %x, <i32 0, i32 1>
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%c = icmp ne <2 x i32> %y, zeroinitializer
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ret <2 x i1> %c
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}
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; Multiplies of non-zero numbers are non-zero if there is no unsigned overflow.
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define <2 x i1> @nonzero_vec_mul_nuw(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @nonzero_vec_mul_nuw(
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; CHECK-NEXT: ret <2 x i1> zeroinitializer
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;
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%xnz = or <2 x i32> %x, <i32 1, i32 2>
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%ynz = or <2 x i32> %y, <i32 3, i32 undef>
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%m = mul nuw <2 x i32> %xnz, %ynz
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%c = icmp eq <2 x i32> %m, zeroinitializer
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ret <2 x i1> %c
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}
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; Multiplies of non-zero numbers are non-zero if there is no signed overflow.
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define <2 x i1> @nonzero_vec_mul_nsw(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @nonzero_vec_mul_nsw(
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; CHECK-NEXT: ret <2 x i1> <i1 true, i1 true>
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;
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%xnz = or <2 x i32> %x, <i32 undef, i32 2>
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%ynz = or <2 x i32> %y, <i32 3, i32 4>
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%m = mul nsw <2 x i32> %xnz, %ynz
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%c = icmp ne <2 x i32> %m, zeroinitializer
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ret <2 x i1> %c
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}
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