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llvm-mirror/test/Transforms/InstSimplify/bitcast-vector-fold.ll
Andrea Di Biagio 5f72d10163 [ConstantFold] Improve the bitcast folding logic for constant vectors. 
The constant folder didn't know how to always fold bitcasts of constant integer
vectors. In particular, it was unable to handle the case where a constant vector
had some undef elements, and the resulting (i.e. bitcasted) vector type had more
elements than the original vector type.

Example:
  %cast = bitcast <2 x i64><i64 undef, i64 2> to <4 x i32>

On a little endian target, %cast could have been folded to:
  <4 x i32><i32 undef, i32 undef, i32 2, i32 0>

This patch improves the folding logic by teaching how to correctly propagate
undef elements in the folded vector.

Differential Revision: https://reviews.llvm.org/D24301

llvm-svn: 281343
2016-09-13 14:50:47 +00:00

270 lines
9.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-f64:32:64-v64:64:64-v128:128:128"
define <2 x i64> @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret <2 x i64> <i64 4294967296, i64 12884901890>
;
%tmp3 = bitcast <4 x i32> < i32 0, i32 1, i32 2, i32 3 > to <2 x i64>
ret <2 x i64> %tmp3
}
define <4 x i32> @test2() {
; CHECK-LABEL: @test2(
; CHECK-NEXT: ret <4 x i32> <i32 0, i32 0, i32 1, i32 0>
;
%tmp3 = bitcast <2 x i64> < i64 0, i64 1 > to <4 x i32>
ret <4 x i32> %tmp3
}
define <2 x double> @test3() {
; CHECK-LABEL: @test3(
; CHECK-NEXT: ret <2 x double> <double 0x100000000, double 0x300000002>
;
%tmp3 = bitcast <4 x i32> < i32 0, i32 1, i32 2, i32 3 > to <2 x double>
ret <2 x double> %tmp3
}
define <4 x float> @test4() {
; CHECK-LABEL: @test4(
; CHECK-NEXT: ret <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0x36A0000000000000, float 0.000000e+00>
;
%tmp3 = bitcast <2 x i64> < i64 0, i64 1 > to <4 x float>
ret <4 x float> %tmp3
}
define <2 x i64> @test5() {
; CHECK-LABEL: @test5(
; CHECK-NEXT: ret <2 x i64> <i64 4575657221408423936, i64 4629700418010611712>
;
%tmp3 = bitcast <4 x float> <float 0.0, float 1.0, float 2.0, float 3.0> to <2 x i64>
ret <2 x i64> %tmp3
}
define <4 x i32> @test6() {
; CHECK-LABEL: @test6(
; CHECK-NEXT: ret <4 x i32> <i32 0, i32 1071644672, i32 0, i32 1072693248>
;
%tmp3 = bitcast <2 x double> <double 0.5, double 1.0> to <4 x i32>
ret <4 x i32> %tmp3
}
define i32 @test7() {
; CHECK-LABEL: @test7(
; CHECK-NEXT: ret i32 1118464
;
%tmp3 = bitcast <2 x half> <half 0xH1100, half 0xH0011> to i32
ret i32 %tmp3
}
define <4 x i32> @test8(<1 x i64> %y) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: ret <4 x i32> zeroinitializer
;
%c = bitcast <2 x i64> <i64 0, i64 0> to <4 x i32>
ret <4 x i32> %c
}
define <4 x i32> @test9(<1 x i64> %y) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: ret <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>
;
%c = bitcast <2 x i64> <i64 -1, i64 -1> to <4 x i32>
ret <4 x i32> %c
}
; from MultiSource/Benchmarks/Bullet
define <2 x float> @foo() {
; CHECK-LABEL: @foo(
; CHECK-NEXT: ret <2 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>
;
%cast = bitcast i64 -1 to <2 x float>
ret <2 x float> %cast
}
define <2 x double> @foo2() {
; CHECK-LABEL: @foo2(
; CHECK-NEXT: ret <2 x double> <double 0xFFFFFFFFFFFFFFFF, double 0xFFFFFFFFFFFFFFFF>
;
%cast = bitcast i128 -1 to <2 x double>
ret <2 x double> %cast
}
define <1 x float> @foo3() {
; CHECK-LABEL: @foo3(
; CHECK-NEXT: ret <1 x float> <float 0xFFFFFFFFE0000000>
;
%cast = bitcast i32 -1 to <1 x float>
ret <1 x float> %cast
}
define float @foo4() {
; CHECK-LABEL: @foo4(
; CHECK-NEXT: ret float 0xFFFFFFFFE0000000
;
%cast = bitcast <1 x i32 ><i32 -1> to float
ret float %cast
}
define double @foo5() {
; CHECK-LABEL: @foo5(
; CHECK-NEXT: ret double 0xFFFFFFFFFFFFFFFF
;
%cast = bitcast <2 x i32 ><i32 -1, i32 -1> to double
ret double %cast
}
define <2 x double> @foo6() {
; CHECK-LABEL: @foo6(
; CHECK-NEXT: ret <2 x double> <double 0xFFFFFFFFFFFFFFFF, double 0xFFFFFFFFFFFFFFFF>
;
%cast = bitcast <4 x i32><i32 -1, i32 -1, i32 -1, i32 -1> to <2 x double>
ret <2 x double> %cast
}
define <4 x i32> @bitcast_constexpr_4i32_2i64_u2() {
; CHECK-LABEL: @bitcast_constexpr_4i32_2i64_u2(
; CHECK-NEXT: ret <4 x i32> <i32 undef, i32 undef, i32 2, i32 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 2> to <4 x i32>
ret <4 x i32> %cast
}
define <4 x i32> @bitcast_constexpr_4i32_2i64_1u() {
; CHECK-LABEL: @bitcast_constexpr_4i32_2i64_1u(
; CHECK-NEXT: ret <4 x i32> <i32 1, i32 0, i32 undef, i32 undef>
;
%cast = bitcast <2 x i64><i64 1, i64 undef> to <4 x i32>
ret <4 x i32> %cast
}
define <4 x i32> @bitcast_constexpr_4i32_2i64() {
; CHECK-LABEL: @bitcast_constexpr_4i32_2i64(
; CHECK-NEXT: ret <4 x i32> <i32 undef, i32 undef, i32 2, i32 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 2> to <4 x i32>
ret <4 x i32> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_2i64_u2() {
; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_u2(
; CHECK-NEXT: ret <8 x i16> <i16 undef, i16 undef, i16 undef, i16 undef, i16 2, i16 0, i16 0, i16 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 2> to <8 x i16>
ret <8 x i16> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_2i64_1u() {
; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_1u(
; CHECK-NEXT: ret <8 x i16> <i16 1, i16 0, i16 0, i16 0, i16 undef, i16 undef, i16 undef, i16 undef>
;
%cast = bitcast <2 x i64><i64 1, i64 undef> to <8 x i16>
ret <8 x i16> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_2i64_u65536() {
; CHECK-LABEL: @bitcast_constexpr_8i16_2i64_u65536(
; CHECK-NEXT: ret <8 x i16> <i16 undef, i16 undef, i16 undef, i16 undef, i16 0, i16 1, i16 0, i16 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 65536> to <8 x i16>
ret <8 x i16> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_2i64_u2() {
; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_u2(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 2, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 2> to <16 x i8>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_2i64_256u() {
; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_256u(
; CHECK-NEXT: ret <16 x i8> <i8 0, i8 1, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef>
;
%cast = bitcast <2 x i64><i64 256, i64 undef> to <16 x i8>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_2i64_u256() {
; CHECK-LABEL: @bitcast_constexpr_16i8_2i64_u256(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 0, i8 1, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>
;
%cast = bitcast <2 x i64><i64 undef, i64 256> to <16 x i8>
ret <16 x i8> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_4i32_uu22() {
; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_uu22(
; CHECK-NEXT: ret <8 x i16> <i16 undef, i16 undef, i16 undef, i16 undef, i16 2, i16 0, i16 2, i16 0>
;
%cast = bitcast <4 x i32><i32 undef, i32 undef, i32 2, i32 2> to <8 x i16>
ret <8 x i16> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_4i32_10uu() {
; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_10uu(
; CHECK-NEXT: ret <8 x i16> <i16 1, i16 0, i16 0, i16 0, i16 undef, i16 undef, i16 undef, i16 undef>
;
%cast = bitcast <4 x i32><i32 1, i32 0, i32 undef, i32 undef> to <8 x i16>
ret <8 x i16> %cast
}
define <8 x i16> @bitcast_constexpr_8i16_4i32_u257u256() {
; CHECK-LABEL: @bitcast_constexpr_8i16_4i32_u257u256(
; CHECK-NEXT: ret <8 x i16> <i16 undef, i16 undef, i16 0, i16 1, i16 undef, i16 undef, i16 0, i16 1>
;
%cast = bitcast <4 x i32><i32 undef, i32 65536, i32 undef, i32 65536> to <8 x i16>
ret <8 x i16> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_4i32_u2u2() {
; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_u2u2(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 undef, i8 undef, i8 2, i8 0, i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 2, i8 0, i8 0, i8 0>
;
%cast = bitcast <4 x i32><i32 undef, i32 2, i32 undef, i32 2> to <16 x i8>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_4i32_1u1u() {
; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_1u1u(
; CHECK-NEXT: ret <16 x i8> <i8 1, i8 0, i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 1, i8 0, i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef>
;
%cast = bitcast <4 x i32><i32 1, i32 undef, i32 1, i32 undef> to <16 x i8>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_4i32_u256uu() {
; CHECK-LABEL: @bitcast_constexpr_16i8_4i32_u256uu(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 undef, i8 undef, i8 0, i8 1, i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef>
;
%cast = bitcast <4 x i32><i32 undef, i32 256, i32 undef, i32 undef> to <16 x i8>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_8i16_u2u2u2u2() {
; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_u2u2u2u2(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 2, i8 0, i8 undef, i8 undef, i8 2, i8 0, i8 undef, i8 undef, i8 2, i8 0, i8 undef, i8 undef, i8 2, i8 0>
;
%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>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_8i16_1u1u1u1u() {
; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_1u1u1u1u(
; CHECK-NEXT: ret <16 x i8> <i8 1, i8 0, i8 undef, i8 undef, i8 1, i8 0, i8 undef, i8 undef, i8 1, i8 0, i8 undef, i8 undef, i8 1, i8 0, i8 undef, i8 undef>
;
%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>
ret <16 x i8> %cast
}
define <16 x i8> @bitcast_constexpr_16i8_8i16_u256uuu256uu() {
; CHECK-LABEL: @bitcast_constexpr_16i8_8i16_u256uuu256uu(
; CHECK-NEXT: ret <16 x i8> <i8 undef, i8 undef, i8 0, i8 1, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 0, i8 1, i8 undef, i8 undef, i8 undef, i8 undef>
;
%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>
ret <16 x i8> %cast
}
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