458dfbd855
Counterexample: 219 is a multiple of 73. But `sext i8 219 to i16 = 65499` is not. Fixes https://github.com/llvm/llvm-project/issues/116483.
37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes=indvars < %s | FileCheck %s
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define i32 @test() {
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; CHECK-LABEL: define i32 @test() {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 0, 3
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; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[XOR]], 329
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; CHECK-NEXT: [[CONV:%.*]] = trunc i32 [[MUL]] to i16
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; CHECK-NEXT: [[SEXT:%.*]] = shl i16 [[CONV]], 8
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; CHECK-NEXT: [[CONV1:%.*]] = ashr i16 [[SEXT]], 8
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; CHECK-NEXT: br label %[[LOOP_BODY:.*]]
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; CHECK: [[LOOP_BODY]]:
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; CHECK-NEXT: br i1 true, label %[[EXIT:.*]], label %[[LOOP_BODY]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: [[CONV3:%.*]] = zext i16 [[CONV1]] to i32
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; CHECK-NEXT: ret i32 [[CONV3]]
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;
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entry:
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%xor = xor i32 0, 3
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%mul = mul i32 %xor, 329
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%conv = trunc i32 %mul to i16
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%sext = shl i16 %conv, 8
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%conv1 = ashr i16 %sext, 8
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%conv3 = zext i16 %conv1 to i32
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br label %loop.body
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loop.body:
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%indvar = phi i32 [ %indvar.inc, %loop.body ], [ 1, %entry ]
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%indvar.inc = add nuw i32 %indvar, 1
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%exitcond = icmp eq i32 %indvar, %conv3
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br i1 %exitcond, label %exit, label %loop.body
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exit:
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ret i32 %conv3
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}
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