forked from OSchip/llvm-project
83 lines
2.3 KiB
LLVM
83 lines
2.3 KiB
LLVM
|
; Test that the strcmp 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 [6 x i8] c"hello\00"
|
||
|
|
@hell = constant [5 x i8] c"hell\00"
|
||
|
|
@bell = constant [5 x i8] c"bell\00"
|
||
|
|
@null = constant [1 x i8] zeroinitializer
|
||
|
|
|
||
|
|
declare i32 @strcmp(i8*, i8*)
|
||
|
|
|
||
|
|
; strcmp("", x) -> -*x
|
||
|
|
define i32 @test1(i8* %str2) {
|
||
|
|
; CHECK: @test1
|
||
|
|
; CHECK: %strcmpload = load i8* %str
|
||
|
|
; CHECK: %1 = zext i8 %strcmpload to i32
|
||
|
|
; CHECK: %2 = sub i32 0, %1
|
||
|
|
; CHECK: ret i32 %2
|
||
|
|
|
||
|
|
%str1 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
|
||
|
|
%temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
|
||
|
|
ret i32 %temp1
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
; strcmp(x, "") -> *x
|
||
|
|
define i32 @test2(i8* %str1) {
|
||
|
|
; CHECK: @test2
|
||
|
|
; CHECK: %strcmpload = load i8* %str
|
||
|
|
; CHECK: %1 = zext i8 %strcmpload to i32
|
||
|
|
; CHECK: ret i32 %1
|
||
|
|
|
||
|
|
%str2 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
|
||
|
|
%temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
|
||
|
|
ret i32 %temp1
|
||
|
|
}
|
||
|
|
|
||
|
|
; strcmp(x, y) -> cnst
|
||
|
|
define i32 @test3() {
|
||
|
|
; CHECK: @test3
|
||
|
|
; CHECK: ret i32 -1
|
||
|
|
|
||
|
|
%str1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
|
||
|
|
%str2 = getelementptr inbounds [6 x i8]* @hello, i32 0, i32 0
|
||
|
|
%temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
|
||
|
|
ret i32 %temp1
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @test4() {
|
||
|
|
; CHECK: @test4
|
||
|
|
; CHECK: ret i32 1
|
||
|
|
|
||
|
|
%str1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
|
||
|
|
%str2 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
|
||
|
|
%temp1 = call i32 @strcmp(i8* %str1, i8* %str2)
|
||
|
|
ret i32 %temp1
|
||
|
|
}
|
||
|
|
|
||
|
|
; strcmp(x, y) -> memcmp(x, y, <known length>)
|
||
|
|
; (This transform is rather difficult to trigger in a useful manner)
|
||
|
|
define i32 @test5(i1 %b) {
|
||
|
|
; CHECK: @test5
|
||
|
|
; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i8* %str2, i32 5)
|
||
|
|
; CHECK: ret i32 %memcmp
|
||
|
|
|
||
|
|
%str1 = getelementptr inbounds [6 x i8]* @hello, i32 0, i32 0
|
||
|
|
%temp1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
|
||
|
|
%temp2 = getelementptr inbounds [5 x i8]* @bell, i32 0, i32 0
|
||
|
|
%str2 = select i1 %b, i8* %temp1, i8* %temp2
|
||
|
|
%temp3 = call i32 @strcmp(i8* %str1, i8* %str2)
|
||
|
|
ret i32 %temp3
|
||
|
|
}
|
||
|
|
|
||
|
|
; strcmp(x,x) -> 0
|
||
|
|
define i32 @test6(i8* %str) {
|
||
|
|
; CHECK: @test6
|
||
|
|
; CHECK: ret i32 0
|
||
|
|
|
||
|
|
%temp1 = call i32 @strcmp(i8* %str, i8* %str)
|
||
|
|
ret i32 %temp1
|
||
|
|
}
|