54795bb16b
These are all but 1 of the select-of-constant tests that appear to be transformed within foldSelectICmpAnd() and the block above it predicated by decomposeBitTestICmp(). As discussed in D45862 (and can be seen in several tests here), we probably want to stop doing those transforms because they can increase the instruction count without benefitting other passes or codegen. The 1 test not included here is a urem test where the bit hackery allows us to remove a urem. To preserve killing that urem, we should do some stronger known-bits analysis or pattern matching of 'urem x, (select-of-pow2-constants)'. llvm-svn: 330768
119 lines
3.2 KiB
LLVM
119 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; No selects should remain.
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define i41 @zext(i1 %C) {
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; CHECK-LABEL: @zext(
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; CHECK-NEXT: [[V:%.*]] = zext i1 %C to i41
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; CHECK-NEXT: ret i41 [[V]]
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;
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%V = select i1 %C, i41 1, i41 0
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ret i41 %V
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}
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define i41 @sext(i1 %C) {
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; CHECK-LABEL: @sext(
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; CHECK-NEXT: [[V:%.*]] = sext i1 %C to i41
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; CHECK-NEXT: ret i41 [[V]]
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;
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%V = select i1 %C, i41 -1, i41 0
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ret i41 %V
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}
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define i999 @not_zext(i1 %C) {
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; CHECK-LABEL: @not_zext(
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; CHECK-NEXT: [[NOT_C:%.*]] = xor i1 %C, true
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; CHECK-NEXT: [[V:%.*]] = zext i1 [[NOT_C]] to i999
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; CHECK-NEXT: ret i999 [[V]]
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;
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%V = select i1 %C, i999 0, i999 1
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ret i999 %V
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}
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define i999 @not_sext(i1 %C) {
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; CHECK-LABEL: @not_sext(
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; CHECK-NEXT: [[NOT_C:%.*]] = xor i1 %C, true
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; CHECK-NEXT: [[V:%.*]] = sext i1 [[NOT_C]] to i999
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; CHECK-NEXT: ret i999 [[V]]
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;
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%V = select i1 %C, i999 0, i999 -1
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ret i999 %V
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}
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; Vector selects of vector splat constants match APInt too.
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define <2 x i41> @zext_vec(<2 x i1> %C) {
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; CHECK-LABEL: @zext_vec(
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; CHECK-NEXT: [[V:%.*]] = zext <2 x i1> %C to <2 x i41>
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; CHECK-NEXT: ret <2 x i41> [[V]]
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;
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%V = select <2 x i1> %C, <2 x i41> <i41 1, i41 1>, <2 x i41> <i41 0, i41 0>
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ret <2 x i41> %V
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}
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define <2 x i32> @sext_vec(<2 x i1> %C) {
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; CHECK-LABEL: @sext_vec(
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; CHECK-NEXT: [[V:%.*]] = sext <2 x i1> %C to <2 x i32>
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; CHECK-NEXT: ret <2 x i32> [[V]]
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;
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%V = select <2 x i1> %C, <2 x i32> <i32 -1, i32 -1>, <2 x i32> <i32 0, i32 0>
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ret <2 x i32> %V
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}
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define <2 x i999> @not_zext_vec(<2 x i1> %C) {
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; CHECK-LABEL: @not_zext_vec(
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; CHECK-NEXT: [[NOT_C:%.*]] = xor <2 x i1> %C, <i1 true, i1 true>
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; CHECK-NEXT: [[V:%.*]] = zext <2 x i1> [[NOT_C]] to <2 x i999>
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; CHECK-NEXT: ret <2 x i999> [[V]]
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;
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%V = select <2 x i1> %C, <2 x i999> <i999 0, i999 0>, <2 x i999> <i999 1, i999 1>
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ret <2 x i999> %V
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}
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define <2 x i64> @not_sext_vec(<2 x i1> %C) {
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; CHECK-LABEL: @not_sext_vec(
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; CHECK-NEXT: [[NOT_C:%.*]] = xor <2 x i1> %C, <i1 true, i1 true>
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; CHECK-NEXT: [[V:%.*]] = sext <2 x i1> [[NOT_C]] to <2 x i64>
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; CHECK-NEXT: ret <2 x i64> [[V]]
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;
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%V = select <2 x i1> %C, <2 x i64> <i64 0, i64 0>, <2 x i64> <i64 -1, i64 -1>
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ret <2 x i64> %V
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}
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; But don't touch this - we would need 3 instructions to extend and splat the scalar select condition.
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define <2 x i32> @scalar_select_of_vectors(i1 %c) {
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; CHECK-LABEL: @scalar_select_of_vectors(
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; CHECK-NEXT: [[V:%.*]] = select i1 %c, <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer
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; CHECK-NEXT: ret <2 x i32> [[V]]
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;
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%V = select i1 %c, <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer
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ret <2 x i32> %V
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}
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;; (x <s 0) ? -1 : 0 -> ashr x, 31
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define i41 @test3(i41 %X) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[X_LOBIT:%.*]] = ashr i41 %X, 40
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; CHECK-NEXT: ret i41 [[X_LOBIT]]
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;
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%t = icmp slt i41 %X, 0
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%V = select i1 %t, i41 -1, i41 0
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ret i41 %V
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}
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;; (x <s 0) ? -1 : 0 -> ashr x, 31
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define i1023 @test4(i1023 %X) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[X_LOBIT:%.*]] = ashr i1023 %X, 1022
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; CHECK-NEXT: ret i1023 [[X_LOBIT]]
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;
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%t = icmp slt i1023 %X, 0
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%V = select i1 %t, i1023 -1, i1023 0
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ret i1023 %V
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}
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