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63 lines
2.0 KiB
LLVM
63 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare void @llvm.assume(i1)
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declare i8 @llvm.ctpop.i8(i8)
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; https://alive2.llvm.org/ce/z/LV_8xy
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define i8 @and_add_shl(i8 %x) {
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; CHECK-LABEL: define i8 @and_add_shl
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; CHECK-SAME: (i8 [[X:%.*]]) {
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; CHECK-NEXT: [[OP1_P2:%.*]] = icmp ult i8 [[X]], 6
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; CHECK-NEXT: call void @llvm.assume(i1 [[OP1_P2]])
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; CHECK-NEXT: [[NOTMASK:%.*]] = shl nsw i8 -1, [[X]]
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; CHECK-NEXT: [[SUB:%.*]] = and i8 [[NOTMASK]], 32
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; CHECK-NEXT: [[R:%.*]] = xor i8 [[SUB]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%op1_p2 = icmp ule i8 %x, 5
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call void @llvm.assume(i1 %op1_p2)
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%shift = shl i8 1, %x
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%sub = add i8 %shift, -1
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%r = and i8 %sub, 32
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ret i8 %r
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}
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; https://alive2.llvm.org/ce/z/YNYYdV
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define i8 @and_not_shl(i8 %x) {
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; CHECK-LABEL: define i8 @and_not_shl
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; CHECK-SAME: (i8 [[X:%.*]]) {
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; CHECK-NEXT: [[OP1_P2:%.*]] = icmp ult i8 [[X]], 6
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; CHECK-NEXT: call void @llvm.assume(i1 [[OP1_P2]])
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; CHECK-NEXT: [[SHIFT:%.*]] = shl nsw i8 -1, [[X]]
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; CHECK-NEXT: [[NOT:%.*]] = and i8 [[SHIFT]], 32
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; CHECK-NEXT: [[R:%.*]] = xor i8 [[NOT]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%op1_p2 = icmp ule i8 %x, 5
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call void @llvm.assume(i1 %op1_p2)
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%shift = shl i8 -1, %x
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%not = xor i8 %shift, -1
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%r = and i8 %not, 32
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ret i8 %r
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}
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; Negative test: https://alive2.llvm.org/ce/z/uWzb4t
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define i8 @and_add_shl_overlap(i8 %x) {
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; CHECK-LABEL: define i8 @and_add_shl_overlap
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; CHECK-SAME: (i8 [[X:%.*]]) {
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; CHECK-NEXT: [[OP1_P2:%.*]] = icmp ult i8 [[X]], 7
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; CHECK-NEXT: call void @llvm.assume(i1 [[OP1_P2]])
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; CHECK-NEXT: [[NOTMASK:%.*]] = shl nsw i8 -1, [[X]]
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; CHECK-NEXT: [[SUB:%.*]] = and i8 [[NOTMASK]], 32
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; CHECK-NEXT: [[R:%.*]] = xor i8 [[SUB]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%op1_p2 = icmp ule i8 %x, 6
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call void @llvm.assume(i1 %op1_p2)
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%shift = shl i8 1, %x
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%sub = add i8 %shift, -1
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%r = and i8 %sub, 32
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ret i8 %r
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}
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