mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-06 21:05:51 +00:00
57cfd71f88
This patch migrates the strlen optimizations from the simplify-libcalls pass into the instcombine library call simplifier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167103 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
2.6 KiB
LLVM
98 lines
2.6 KiB
LLVM
; Test that the strlen 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"
|
|
@null = constant [1 x i8] zeroinitializer
|
|
@null_hello = constant [7 x i8] c"\00hello\00"
|
|
@nullstring = constant i8 0
|
|
@a = common global [32 x i8] zeroinitializer, align 1
|
|
|
|
declare i32 @strlen(i8*)
|
|
|
|
; Check strlen(string constant) -> integer constant.
|
|
|
|
define i32 @test_simplify1() {
|
|
; CHECK: @test_simplify1
|
|
%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
|
%hello_l = call i32 @strlen(i8* %hello_p)
|
|
ret i32 %hello_l
|
|
; CHECK-NEXT: ret i32 5
|
|
}
|
|
|
|
define i32 @test_simplify2() {
|
|
; CHECK: @test_simplify2
|
|
%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0
|
|
%null_l = call i32 @strlen(i8* %null_p)
|
|
ret i32 %null_l
|
|
; CHECK-NEXT: ret i32 0
|
|
}
|
|
|
|
define i32 @test_simplify3() {
|
|
; CHECK: @test_simplify3
|
|
%null_hello_p = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
|
|
%null_hello_l = call i32 @strlen(i8* %null_hello_p)
|
|
ret i32 %null_hello_l
|
|
; CHECK-NEXT: ret i32 0
|
|
}
|
|
|
|
define i32 @test_simplify4() {
|
|
; CHECK: @test_simplify4
|
|
%len = tail call i32 @strlen(i8* @nullstring) nounwind
|
|
ret i32 %len
|
|
; CHECK-NEXT: ret i32 0
|
|
}
|
|
|
|
; Check strlen(x) == 0 --> *x == 0.
|
|
|
|
define i1 @test_simplify5() {
|
|
; CHECK: @test_simplify5
|
|
%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
|
%hello_l = call i32 @strlen(i8* %hello_p)
|
|
%eq_hello = icmp eq i32 %hello_l, 0
|
|
ret i1 %eq_hello
|
|
; CHECK-NEXT: ret i1 false
|
|
}
|
|
|
|
define i1 @test_simplify6() {
|
|
; CHECK: @test_simplify6
|
|
%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0
|
|
%null_l = call i32 @strlen(i8* %null_p)
|
|
%eq_null = icmp eq i32 %null_l, 0
|
|
ret i1 %eq_null
|
|
; CHECK-NEXT: ret i1 true
|
|
}
|
|
|
|
; Check strlen(x) != 0 --> *x != 0.
|
|
|
|
define i1 @test_simplify7() {
|
|
; CHECK: @test_simplify7
|
|
%hello_p = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
|
%hello_l = call i32 @strlen(i8* %hello_p)
|
|
%ne_hello = icmp ne i32 %hello_l, 0
|
|
ret i1 %ne_hello
|
|
; CHECK-NEXT: ret i1 true
|
|
}
|
|
|
|
define i1 @test_simplify8() {
|
|
; CHECK: @test_simplify8
|
|
%null_p = getelementptr [1 x i8]* @null, i32 0, i32 0
|
|
%null_l = call i32 @strlen(i8* %null_p)
|
|
%ne_null = icmp ne i32 %null_l, 0
|
|
ret i1 %ne_null
|
|
; CHECK-NEXT: ret i1 false
|
|
}
|
|
|
|
; Check cases that shouldn't be simplified.
|
|
|
|
define i32 @test_no_simplify1() {
|
|
; CHECK: @test_no_simplify1
|
|
%a_p = getelementptr [32 x i8]* @a, i32 0, i32 0
|
|
%a_l = call i32 @strlen(i8* %a_p)
|
|
; CHECK-NEXT: %a_l = call i32 @strlen
|
|
ret i32 %a_l
|
|
; CHECK-NEXT: ret i32 %a_l
|
|
}
|