1; RUN: opt -passes=instcombine -S < %s | FileCheck %s 2 3; #include <stdlib.h> 4; #include <stdio.h> 5; 6; int foo1(int N) { 7; char Big[20]; 8; char Small[10]; 9; char *Ptr = N ? Big + 10 : Small; 10; return __builtin_object_size(Ptr, 0); 11; } 12; 13; void foo() { 14; size_t ret; 15; ret = foo1(0); 16; printf("\n %d", ret); 17; } 18 19target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 20target triple = "x86_64-unknown-linux-gnu" 21 22@.str = private unnamed_addr constant [5 x i8] c"\0A %d\00", align 1 23 24define i32 @foo1(i32 %N) { 25entry: 26 %Big = alloca [20 x i8], align 16 27 %Small = alloca [10 x i8], align 1 28 call void @llvm.lifetime.start.p0(i64 20, ptr %Big) 29 call void @llvm.lifetime.start.p0(i64 10, ptr %Small) 30 %tobool = icmp ne i32 %N, 0 31 %add.ptr = getelementptr inbounds [20 x i8], ptr %Big, i64 0, i64 10 32 %cond = select i1 %tobool, ptr %add.ptr, ptr %Small 33 %0 = call i64 @llvm.objectsize.i64.p0(ptr %cond, i1 false) 34 %conv = trunc i64 %0 to i32 35 call void @llvm.lifetime.end.p0(i64 10, ptr %Small) 36 call void @llvm.lifetime.end.p0(i64 20, ptr %Big) 37 ret i32 %conv 38; CHECK: ret i32 10 39} 40 41declare void @llvm.lifetime.start.p0(i64, ptr nocapture) 42 43declare i64 @llvm.objectsize.i64.p0(ptr, i1) 44 45declare void @llvm.lifetime.end.p0(i64, ptr nocapture) 46 47define void @foo() { 48entry: 49 %call = tail call i32 @foo1(i32 0) 50 %conv = sext i32 %call to i64 51 %call1 = tail call i32 (ptr, ...) @printf(ptr @.str, i64 %conv) 52 ret void 53} 54 55declare i32 @printf(ptr nocapture readonly, ...) 56 57