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https://github.com/c64scene-ar/llvm-6502.git
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792860883e
While I'm here, fix the related issue with strncmp, add some actual tests for strcmp and strncmp, and start using StringRef::compare for constant folding instead of using strcmp/strncmp so that the optimized IR isn't dependent on the host's implementation of strcmp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141227 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
2.3 KiB
LLVM
66 lines
2.3 KiB
LLVM
; Test that the StrCmpOptimizer works correctly
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; RUN: opt < %s -simplify-libcalls -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" ; <[6 x i8]*> [#uses=1]
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@hell = constant [5 x i8] c"hell\00" ; <[5 x i8]*> [#uses=1]
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@bell = constant [5 x i8] c"bell\00" ; <[5 x i8]*> [#uses=1]
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@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
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declare i32 @strcmp(i8*, i8*)
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; strcmp("", x) -> -*x
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define i32 @test1(i8* %str) {
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%temp1 = call i32 @strcmp(i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0), i8* %str)
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ret i32 %temp1
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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: %temp1 = sub i32 0, %1
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; CHECK: ret i32 %temp1
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}
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; strcmp(x, "") -> *x
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define i32 @test2(i8* %str) {
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%temp1 = call i32 @strcmp(i8* %str, i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0))
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ret i32 %temp1
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; CHECK: @test2
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; CHECK: %strcmpload = load i8* %str
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; CHECK: %temp1 = zext i8 %strcmpload to i32
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; CHECK: ret i32 %temp1
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}
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; strcmp(x, y) -> cnst
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define i32 @test3() {
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%temp1 = call i32 @strcmp(i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0))
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ret i32 %temp1
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; CHECK: @test3
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; CHECK: ret i32 -1
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}
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define i32 @test4() {
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%temp1 = call i32 @strcmp(i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([1 x i8]* @null, i32 0, i32 0))
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ret i32 %temp1
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; CHECK: @test4
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; CHECK: ret i32 1
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}
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; strcmp(x, y) -> memcmp(x, y, <known length>)
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; (This transform is rather difficult to trigger in a useful manner)
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define i32 @test5(i1 %b) {
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%sel = select i1 %b, i8* getelementptr inbounds ([5 x i8]* @hell, i32 0, i32 0), i8* getelementptr inbounds ([5 x i8]* @bell, i32 0, i32 0)
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%temp1 = call i32 @strcmp(i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i8* %sel)
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ret i32 %temp1
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; CHECK: @test5
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; CHECK: %memcmp = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8]* @hello, i32 0, i32 0), i8* %sel, i32 5)
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; CHECK: ret i32 %memcmp
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}
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; strcmp(x,x) -> 0
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define i32 @test6(i8* %str) {
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%temp1 = call i32 @strcmp(i8* %str, i8* %str)
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ret i32 %temp1
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; CHECK: @test6
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; CHECK: ret i32 0
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}
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