[InstSimplify] Add tests to show missed bitcast folding opportunities.
InstSimplify doesn't always know how to fold a bitcast of a constant vector. In particular, the logic in InstSimplify doesn't know how to handle the case where the constant vector in input contains some undef elements, and the number of elements is smaller than the number of elements of the bitcast vector type. llvm-svn: 281332
This commit is contained in:
Andrea Di Biagio
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61683a22cb
commit
3647a96a44
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@ -123,3 +123,147 @@ define <2 x double> @foo6() {
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%cast = bitcast <4 x i32><i32 -1, i32 -1, i32 -1, i32 -1> to <2 x double>
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ret <2 x double> %cast
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}
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define <4 x i32> @bitcast_constexpr_4i32_2i64_u2() {
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; CHECK-LABEL: @bitcast_constexpr_4i32_2i64_u2(
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; CHECK-NEXT: ret <4 x i32> bitcast (<2 x i64> <i64 undef, i64 2> to <4 x i32>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 2> to <4 x i32>
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ret <4 x i32> %cast
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}
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define <4 x i32> @bitcast_constexpr_4i32_2i64_1u() {
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; CHECK-LABEL: @bitcast_constexpr_4i32_2i64_1u(
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; CHECK-NEXT: ret <4 x i32> bitcast (<2 x i64> <i64 1, i64 undef> to <4 x i32>)
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;
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%cast = bitcast <2 x i64><i64 1, i64 undef> to <4 x i32>
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ret <4 x i32> %cast
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}
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define <4 x i32> @bitcast_constexpr_4i32_2i64() {
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; CHECK-LABEL: @bitcast_constexpr_4i32_2i64(
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; CHECK-NEXT: ret <4 x i32> bitcast (<2 x i64> <i64 undef, i64 2> to <4 x i32>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 2> to <4 x i32>
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ret <4 x i32> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_2i64_u2() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_u2(
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; CHECK-NEXT: ret <8 x i16> bitcast (<2 x i64> <i64 undef, i64 2> to <8 x i16>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 2> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_2i64_1u() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_1u(
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; CHECK-NEXT: ret <8 x i16> bitcast (<2 x i64> <i64 1, i64 undef> to <8 x i16>)
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;
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%cast = bitcast <2 x i64><i64 1, i64 undef> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_2i64_u65536() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_u65536(
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; CHECK-NEXT: ret <8 x i16> bitcast (<2 x i64> <i64 undef, i64 65536> to <8 x i16>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 65536> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_2i64_u2() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_u2(
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; CHECK-NEXT: ret <16 x i8> bitcast (<2 x i64> <i64 undef, i64 2> to <16 x i8>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 2> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_2i64_256u() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_256u(
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; CHECK-NEXT: ret <16 x i8> bitcast (<2 x i64> <i64 256, i64 undef> to <16 x i8>)
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;
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%cast = bitcast <2 x i64><i64 256, i64 undef> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_2i64_u256() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_u256(
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; CHECK-NEXT: ret <16 x i8> bitcast (<2 x i64> <i64 undef, i64 256> to <16 x i8>)
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;
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%cast = bitcast <2 x i64><i64 undef, i64 256> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_4i32_uu22() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_uu22(
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; CHECK-NEXT: ret <8 x i16> bitcast (<4 x i32> <i32 undef, i32 undef, i32 2, i32 2> to <8 x i16>)
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;
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%cast = bitcast <4 x i32><i32 undef, i32 undef, i32 2, i32 2> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_4i32_10uu() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_10uu(
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; CHECK-NEXT: ret <8 x i16> bitcast (<4 x i32> <i32 1, i32 0, i32 undef, i32 undef> to <8 x i16>)
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;
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%cast = bitcast <4 x i32><i32 1, i32 0, i32 undef, i32 undef> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <8 x i16> @bitcast_constexpr_8i16_4i32_u257u256() {
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; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_u257u256(
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; CHECK-NEXT: ret <8 x i16> bitcast (<4 x i32> <i32 undef, i32 65536, i32 undef, i32 65536> to <8 x i16>)
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;
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%cast = bitcast <4 x i32><i32 undef, i32 65536, i32 undef, i32 65536> to <8 x i16>
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ret <8 x i16> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_4i32_u2u2() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_u2u2(
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; CHECK-NEXT: ret <16 x i8> bitcast (<4 x i32> <i32 undef, i32 2, i32 undef, i32 2> to <16 x i8>)
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;
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%cast = bitcast <4 x i32><i32 undef, i32 2, i32 undef, i32 2> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_4i32_1u1u() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_1u1u(
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; CHECK-NEXT: ret <16 x i8> bitcast (<4 x i32> <i32 1, i32 undef, i32 1, i32 undef> to <16 x i8>)
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;
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%cast = bitcast <4 x i32><i32 1, i32 undef, i32 1, i32 undef> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_4i32_u256uu() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_u256uu(
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; CHECK-NEXT: ret <16 x i8> bitcast (<4 x i32> <i32 undef, i32 256, i32 undef, i32 undef> to <16 x i8>)
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;
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%cast = bitcast <4 x i32><i32 undef, i32 256, i32 undef, i32 undef> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_8i16_u2u2u2u2() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_u2u2u2u2(
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; CHECK-NEXT: ret <16 x i8> bitcast (<8 x i16> <i16 undef, i16 2, i16 undef, i16 2, i16 undef, i16 2, i16 undef, i16 2> to <16 x i8>)
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;
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%cast = bitcast <8 x i16><i16 undef, i16 2, i16 undef, i16 2, i16 undef, i16 2, i16 undef, i16 2> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_8i16_1u1u1u1u() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_1u1u1u1u(
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; CHECK-NEXT: ret <16 x i8> bitcast (<8 x i16> <i16 1, i16 undef, i16 1, i16 undef, i16 1, i16 undef, i16 1, i16 undef> to <16 x i8>)
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;
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%cast = bitcast <8 x i16><i16 1, i16 undef, i16 1, i16 undef, i16 1, i16 undef, i16 1, i16 undef> to <16 x i8>
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ret <16 x i8> %cast
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}
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define <16 x i8> @bitcast_constexpr_16i8_8i16_u256uuu256uu() {
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; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_u256uuu256uu(
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; CHECK-NEXT: ret <16 x i8> bitcast (<8 x i16> <i16 undef, i16 256, i16 undef, i16 undef, i16 undef, i16 256, i16 undef, i16 undef> to <16 x i8>)
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;
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%cast = bitcast <8 x i16><i16 undef, i16 256, i16 undef, i16 undef, i16 undef, i16 256, i16 undef, i16 undef> to <16 x i8>
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ret <16 x i8> %cast
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}
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