92d55e7336
We currently have two similar implementations of this concept:
isNoAliasCall() only checks for the noalias return attribute.
isNoAliasFn() also checks for allocation functions.
We should switch to only checking the attribute. SLC is responsible
for inferring the noalias return attribute for non-new allocation
functions (with a missing case fixed in
348bc76e35).
For new, clang is responsible for setting the attribute,
if -fno-assume-sane-operator-new is not passed.
Differential Revision: https://reviews.llvm.org/D116800
82 lines
2.2 KiB
LLVM
82 lines
2.2 KiB
LLVM
; RUN: opt -S -basic-aa -gvn < %s | FileCheck %s
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; RUN: opt -S -basic-aa -gvn -disable-simplify-libcalls < %s | FileCheck %s -check-prefix=CHECK_NO_LIBCALLS
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; PR13694
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.8.0"
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declare noalias i8* @malloc(i64) nounwind
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define noalias i8* @test1() nounwind uwtable ssp {
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entry:
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%call = tail call i8* @malloc(i64 100) nounwind
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%0 = load i8, i8* %call, align 1
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%tobool = icmp eq i8 %0, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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store i8 0, i8* %call, align 1
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret i8* %call
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; CHECK-LABEL: @test1(
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; CHECK-NOT: load
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; CHECK-NOT: icmp
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; CHECK_NO_LIBCALLS-LABEL: @test1(
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; CHECK_NO_LIBCALLS: load
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; CHECK_NO_LIBCALLS: icmp
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}
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declare noalias i8* @_Znwm(i64) nounwind
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define noalias i8* @test2() nounwind uwtable ssp {
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entry:
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%call = tail call i8* @_Znwm(i64 100) nounwind
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%0 = load i8, i8* %call, align 1
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%tobool = icmp eq i8 %0, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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store i8 0, i8* %call, align 1
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret i8* %call
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; CHECK-LABEL: @test2(
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; CHECK-NOT: load
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; CHECK-NOT: icmp
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; CHECK_NO_LIBCALLS-LABEL: @test2(
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; CHECK_NO_LIBCALLS: load
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; CHECK_NO_LIBCALLS: icmp
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}
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declare noalias i8* @aligned_alloc(i64, i64) nounwind
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define noalias i8* @test3() nounwind uwtable ssp {
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entry:
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%call = tail call i8* @aligned_alloc(i64 256, i64 32) nounwind
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%0 = load i8, i8* %call, align 32
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%tobool = icmp eq i8 %0, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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store i8 0, i8* %call, align 1
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br label %if.end
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if.end: ; preds = %if.then, %entry
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ret i8* %call
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; CHECK-LABEL: @test3(
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; CHECK-NOT: load
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; CHECK-NOT: icmp
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; CHECK_NO_LIBCALLS-LABEL: @test3(
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; CHECK_NO_LIBCALLS: load
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; CHECK_NO_LIBCALLS: icmp
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}
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