mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
8e7e7e2058
Enhancing value tracking's analysis of null-ness was suggested in D27855, so here's a first attempt at that. This is part of solving: https://llvm.org/bugs/show_bug.cgi?id=28430 Differential Revision: https://reviews.llvm.org/D28204 llvm-svn: 294897
51 lines
1.4 KiB
LLVM
51 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
; InstCombine should mark null-checked argument as nonnull at callsite
|
|
declare void @dummy(i32*, i32)
|
|
|
|
define void @test(i32* %a, i32 %b) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[COND1:%.*]] = icmp eq i32* %a, null
|
|
; CHECK-NEXT: br i1 [[COND1]], label %dead, label %not_null
|
|
; CHECK: not_null:
|
|
; CHECK-NEXT: [[COND2:%.*]] = icmp eq i32 %b, 0
|
|
; CHECK-NEXT: br i1 [[COND2]], label %dead, label %not_zero
|
|
; CHECK: not_zero:
|
|
; CHECK-NEXT: call void @dummy(i32* nonnull %a, i32 %b)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: dead:
|
|
; CHECK-NEXT: unreachable
|
|
;
|
|
entry:
|
|
%cond1 = icmp eq i32* %a, null
|
|
br i1 %cond1, label %dead, label %not_null
|
|
not_null:
|
|
%cond2 = icmp eq i32 %b, 0
|
|
br i1 %cond2, label %dead, label %not_zero
|
|
not_zero:
|
|
call void @dummy(i32* %a, i32 %b)
|
|
ret void
|
|
dead:
|
|
unreachable
|
|
}
|
|
|
|
; The nonnull attribute in the 'bar' declaration is
|
|
; propagated to the parameters of the 'baz' callsite.
|
|
|
|
declare void @bar(i8*, i8* nonnull)
|
|
declare void @baz(i8*, i8*)
|
|
|
|
define void @deduce_nonnull_from_another_call(i8* %a, i8* %b) {
|
|
; CHECK-LABEL: @deduce_nonnull_from_another_call(
|
|
; CHECK-NEXT: call void @bar(i8* %a, i8* %b)
|
|
; CHECK-NEXT: call void @baz(i8* nonnull %b, i8* nonnull %b)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
call void @bar(i8* %a, i8* %b)
|
|
call void @baz(i8* %b, i8* %b)
|
|
ret void
|
|
}
|
|
|