derek.holloway
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42 lines
1.2 KiB
LLVM
42 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define ptr @example(ptr dereferenceable(24) %x) {
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; CHECK-LABEL: @example(
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; CHECK-NEXT: ret ptr [[X:%.*]]
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;
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%y = load ptr, ptr %x, align 8
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%y_is_null = icmp eq ptr %y, null
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%res = select i1 %y_is_null, ptr null, ptr %x
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%nonnull = icmp ne ptr %res, null
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call void @llvm.assume(i1 %nonnull)
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ret ptr %res
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}
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; TODO: this should be folded to `ret ptr %x` as well.
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define ptr @example2(ptr %x) {
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; CHECK-LABEL: @example2(
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; CHECK-NEXT: [[Y:%.*]] = load ptr, ptr [[X:%.*]], align 8
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; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp eq ptr [[Y]], null
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; CHECK-NEXT: [[RES:%.*]] = select i1 [[Y_IS_NULL]], ptr null, ptr [[X]]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "nonnull"(ptr [[RES]]) ]
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; CHECK-NEXT: ret ptr [[RES]]
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;
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%y = load ptr, ptr %x, align 8
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%y_is_null = icmp eq ptr %y, null
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%res = select i1 %y_is_null, ptr null, ptr %x
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%nonnull = icmp ne ptr %res, null
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call void @llvm.assume(i1 %nonnull)
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ret ptr %res
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}
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declare void @llvm.assume(i1)
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