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a24293f9d8
This patch migrates the strcmp and strncmp optimizations from the simplify-libcalls pass into the instcombine library call simplifier. llvm-svn: 165915
98 lines
2.6 KiB
LLVM
98 lines
2.6 KiB
LLVM
; Test that the strncmp library call simplifier works correctly.
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; RUN: opt < %s -instcombine -S | FileCheck %s
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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"
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@hello = constant [6 x i8] c"hello\00"
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@hell = constant [5 x i8] c"hell\00"
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@bell = constant [5 x i8] c"bell\00"
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@null = constant [1 x i8] zeroinitializer
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declare i32 @strncmp(i8*, i8*, i32)
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; strncmp("", x, n) -> -*x
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define i32 @test1(i8* %str2) {
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; CHECK: @test1
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; CHECK: %strcmpload = load i8* %str
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; CHECK: %1 = zext i8 %strcmpload to i32
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; CHECK: %2 = sub i32 0, %1
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; CHECK: ret i32 %2
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%str1 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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; strncmp(x, "", n) -> *x
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define i32 @test2(i8* %str1) {
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; CHECK: @test2
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; CHECK: %strcmpload = load i8* %str1
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; CHECK: %1 = zext i8 %strcmpload to i32
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; CHECK: ret i32 %1
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%str2 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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; strncmp(x, y, n) -> cnst
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define i32 @test3() {
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; CHECK: @test3
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; CHECK: ret i32 -1
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%str1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [6 x i8]* @hello, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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define i32 @test4() {
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; CHECK: @test4
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; CHECK: ret i32 1
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%str1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [1 x i8]* @null, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10)
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ret i32 %temp1
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}
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define i32 @test5() {
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; CHECK: @test5
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; CHECK: ret i32 0
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%str1 = getelementptr inbounds [5 x i8]* @hell, i32 0, i32 0
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%str2 = getelementptr inbounds [6 x i8]* @hello, i32 0, i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 4)
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ret i32 %temp1
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}
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; strncmp(x,y,1) -> memcmp(x,y,1)
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; TODO: Once the memcmp simplifier gets moved into the instcombine pass
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; the following memcmp will be folded into two loads and a subtract.
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define i32 @test6(i8* %str1, i8* %str2) {
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; CHECK: @test6
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; CHECK: call i32 @memcmp
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; CHECK: ret i32 %memcmp
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1)
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ret i32 %temp1
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}
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; strncmp(x,y,0) -> 0
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define i32 @test7(i8* %str1, i8* %str2) {
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; CHECK: @test7
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; CHECK: ret i32 0
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%temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0)
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ret i32 %temp1
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}
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; strncmp(x,x,n) -> 0
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define i32 @test8(i8* %str, i32 %n) {
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; CHECK: @test8
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; CHECK: ret i32 0
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%temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n)
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ret i32 %temp1
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}
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