forked from OSchip/llvm-project
59 lines
1.6 KiB
LLVM
59 lines
1.6 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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; #include <stdlib.h>
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; #include <stdio.h>
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;
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; int foo1(int N) {
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; char Big[20];
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; char Small[10];
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; char *Ptr = N ? Big + 10 : Small;
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; return __builtin_object_size(Ptr, 0);
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; }
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;
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; void foo() {
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; size_t ret;
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; ret = foo1(0);
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; printf("\n %d", ret);
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; }
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@.str = private unnamed_addr constant [5 x i8] c"\0A %d\00", align 1
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define i32 @foo1(i32 %N) {
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entry:
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%Big = alloca [20 x i8], align 16
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%Small = alloca [10 x i8], align 1
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%0 = getelementptr inbounds [20 x i8], [20 x i8]* %Big, i64 0, i64 0
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call void @llvm.lifetime.start(i64 20, i8* %0)
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%1 = getelementptr inbounds [10 x i8], [10 x i8]* %Small, i64 0, i64 0
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call void @llvm.lifetime.start(i64 10, i8* %1)
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%tobool = icmp ne i32 %N, 0
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%add.ptr = getelementptr inbounds [20 x i8], [20 x i8]* %Big, i64 0, i64 10
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%cond = select i1 %tobool, i8* %add.ptr, i8* %1
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%2 = call i64 @llvm.objectsize.i64.p0i8(i8* %cond, i1 false)
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%conv = trunc i64 %2 to i32
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call void @llvm.lifetime.end(i64 10, i8* %1)
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call void @llvm.lifetime.end(i64 20, i8* %0)
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ret i32 %conv
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; CHECK: ret i32 10
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}
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declare void @llvm.lifetime.start(i64, i8* nocapture)
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1)
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declare void @llvm.lifetime.end(i64, i8* nocapture)
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define void @foo() {
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entry:
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%call = tail call i32 @foo1(i32 0)
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%conv = sext i32 %call to i64
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%call1 = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i64 %conv)
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ret void
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}
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declare i32 @printf(i8* nocapture readonly, ...)
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