4def99e642
There is still some such patterns that require collaboration of folds to handle,that we don't currently do.
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
|
|
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
define ptr @example(ptr dereferenceable(24) %x) {
|
|
; CHECK-LABEL: @example(
|
|
; CHECK-NEXT: ret ptr [[X:%.*]]
|
|
;
|
|
%y = load ptr, ptr %x, align 8
|
|
%y_is_null = icmp eq ptr %y, null
|
|
|
|
%res = select i1 %y_is_null, ptr null, ptr %x
|
|
|
|
%nonnull = icmp ne ptr %res, null
|
|
call void @llvm.assume(i1 %nonnull)
|
|
|
|
ret ptr %res
|
|
}
|
|
|
|
; TODO: this should be folded to `ret ptr %x` as well.
|
|
define ptr @example2(ptr %x) {
|
|
; CHECK-LABEL: @example2(
|
|
; CHECK-NEXT: [[Y:%.*]] = load ptr, ptr [[X:%.*]], align 8
|
|
; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp eq ptr [[Y]], null
|
|
; CHECK-NEXT: [[RES:%.*]] = select i1 [[Y_IS_NULL]], ptr null, ptr [[X]]
|
|
; CHECK-NEXT: [[NONNULL:%.*]] = icmp ne ptr [[RES]], null
|
|
; CHECK-NEXT: call void @llvm.assume(i1 [[NONNULL]])
|
|
; CHECK-NEXT: ret ptr [[RES]]
|
|
;
|
|
%y = load ptr, ptr %x, align 8
|
|
%y_is_null = icmp eq ptr %y, null
|
|
|
|
%res = select i1 %y_is_null, ptr null, ptr %x
|
|
|
|
%nonnull = icmp ne ptr %res, null
|
|
call void @llvm.assume(i1 %nonnull)
|
|
|
|
ret ptr %res
|
|
}
|
|
|
|
declare void @llvm.assume(i1)
|