llvm-6502/test/Transforms/InstCombine/strchr-1.ll
Yunzhong Gao b187b69170 Fixing a corner-case bug in strchr and strrchr lib call optimizations where
the input character is not converted to char before comparing with zero.

The patch was discussed in this thread:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130812/184069.html



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188489 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-15 20:58:59 +00:00

66 lines
1.8 KiB
LLVM

; Test that the strchr library call simplifier works correctly.
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@hello = constant [14 x i8] c"hello world\5Cn\00"
@null = constant [1 x i8] zeroinitializer
@chp = global i8* zeroinitializer
declare i8* @strchr(i8*, i32)
define void @test_simplify1() {
; CHECK: store i8* getelementptr inbounds ([14 x i8]* @hello, i32 0, i32 6)
; CHECK-NOT: call i8* @strchr
; CHECK: ret void
%str = getelementptr [14 x i8]* @hello, i32 0, i32 0
%dst = call i8* @strchr(i8* %str, i32 119)
store i8* %dst, i8** @chp
ret void
}
define void @test_simplify2() {
; CHECK: store i8* null, i8** @chp, align 4
; CHECK-NOT: call i8* @strchr
; CHECK: ret void
%str = getelementptr [1 x i8]* @null, i32 0, i32 0
%dst = call i8* @strchr(i8* %str, i32 119)
store i8* %dst, i8** @chp
ret void
}
define void @test_simplify3() {
; CHECK: store i8* getelementptr inbounds ([14 x i8]* @hello, i32 0, i32 13)
; CHECK-NOT: call i8* @strchr
; CHECK: ret void
%src = getelementptr [14 x i8]* @hello, i32 0, i32 0
%dst = call i8* @strchr(i8* %src, i32 0)
store i8* %dst, i8** @chp
ret void
}
define void @test_simplify4(i32 %chr) {
; CHECK: call i8* @memchr
; CHECK-NOT: call i8* @strchr
; CHECK: ret void
%src = getelementptr [14 x i8]* @hello, i32 0, i32 0
%dst = call i8* @strchr(i8* %src, i32 %chr)
store i8* %dst, i8** @chp
ret void
}
define void @test_simplify5() {
; CHECK: store i8* getelementptr inbounds ([14 x i8]* @hello, i32 0, i32 13)
; CHECK-NOT: call i8* @strchr
; CHECK: ret void
%src = getelementptr [14 x i8]* @hello, i32 0, i32 0
%dst = call i8* @strchr(i8* %src, i32 65280)
store i8* %dst, i8** @chp
ret void
}