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https://github.com/RPCS3/llvm-mirror.git
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8755396e8d
The benefits of this change include: 1. Remove DeMorgan-matching code that was added specifically to work-around the missing transform in http://reviews.llvm.org/rL248634. 2. Makes the DeMorgan transform work for vectors too. 3. Fix PR28476: https://llvm.org/bugs/show_bug.cgi?id=28476 Extending this transform to other casts and other associative operators may be useful too. See https://reviews.llvm.org/D22421 for a prerequisite for doing that though. Differential Revision: https://reviews.llvm.org/D22271 llvm-svn: 276221
145 lines
3.7 KiB
LLVM
145 lines
3.7 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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;; ((X & 27) ? 27 : 0)
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define i41 @test5(i41 %X) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[Y:%.*]] = and i41 %X, 32
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; CHECK-NEXT: ret i41 [[Y]]
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;
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%Y = and i41 %X, 32
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%t = icmp ne i41 %Y, 0
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%V = select i1 %t, i41 32, i41 0
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ret i41 %V
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}
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;; ((X & 27) ? 27 : 0)
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define i1023 @test6(i1023 %X) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[Y:%.*]] = and i1023 %X, 64
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; CHECK-NEXT: ret i1023 [[Y]]
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;
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%Y = and i1023 %X, 64
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%t = icmp ne i1023 %Y, 0
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%V = select i1 %t, i1023 64, i1023 0
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ret i1023 %V
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}
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