diff options
| -rw-r--r-- | llvm/test/Transforms/InstCombine/strlen-1.ll | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/strlen-1.ll b/llvm/test/Transforms/InstCombine/strlen-1.ll index 813fd77b4e9..65f742a2bef 100644 --- a/llvm/test/Transforms/InstCombine/strlen-1.ll +++ b/llvm/test/Transforms/InstCombine/strlen-1.ll @@ -11,6 +11,7 @@ target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f3 @null_hello = constant [7 x i8] c"\00hello\00" @nullstring = constant i8 0 @a = common global [32 x i8] zeroinitializer, align 1 +@null_hello_mid = constant [13 x i8] c"hello wor\00ld\00" declare i32 @strlen(i8*) @@ -107,6 +108,35 @@ define i32 @test_simplify9(i1 %x) { ret i32 %l } +; Check the case that should be simplified to a sub instruction. +; strlen(@hello + x) --> 5 - x + +define i32 @test_simplify10(i32 %x) { +; CHECK-LABEL: @test_simplify10( +; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 %x +; CHECK-NEXT: [[HELLO_L:%.*]] = call i32 @strlen(i8* [[HELLO_P]]) +; CHECK-NEXT: ret i32 [[HELLO_L]] +; + %hello_p = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 %x + %hello_l = call i32 @strlen(i8* %hello_p) + ret i32 %hello_l +} + +; strlen(@null_hello_mid + (x & 7)) --> 9 - (x & 7) + +define i32 @test_simplify11(i32 %x) { +; CHECK-LABEL: @test_simplify11( +; CHECK-NEXT: [[AND:%.*]] = and i32 %x, 7 +; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [13 x i8], [13 x i8]* @null_hello_mid, i32 0, i32 [[AND]] +; CHECK-NEXT: [[HELLO_L:%.*]] = call i32 @strlen(i8* [[HELLO_P]]) +; CHECK-NEXT: ret i32 [[HELLO_L]] +; + %and = and i32 %x, 7 + %hello_p = getelementptr inbounds [13 x i8], [13 x i8]* @null_hello_mid, i32 0, i32 %and + %hello_l = call i32 @strlen(i8* %hello_p) + ret i32 %hello_l +} + ; Check cases that shouldn't be simplified. define i32 @test_no_simplify1() { @@ -118,3 +148,32 @@ define i32 @test_no_simplify1() { %a_l = call i32 @strlen(i8* %a_p) ret i32 %a_l } + +; strlen(@null_hello + x) should not be simplified to a sub instruction. + +define i32 @test_no_simplify2(i32 %x) { +; CHECK-LABEL: @test_no_simplify2( +; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* @null_hello, i32 0, i32 %x +; CHECK-NEXT: [[HELLO_L:%.*]] = call i32 @strlen(i8* [[HELLO_P]]) +; CHECK-NEXT: ret i32 [[HELLO_L]] +; + %hello_p = getelementptr inbounds [7 x i8], [7 x i8]* @null_hello, i32 0, i32 %x + %hello_l = call i32 @strlen(i8* %hello_p) + ret i32 %hello_l +} + +; strlen(@null_hello_mid + (x & 15)) should not be simplified to a sub instruction. + +define i32 @test_no_simplify3(i32 %x) { +; CHECK-LABEL: @test_no_simplify3( +; CHECK-NEXT: [[AND:%.*]] = and i32 %x, 15 +; CHECK-NEXT: [[HELLO_P:%.*]] = getelementptr inbounds [13 x i8], [13 x i8]* @null_hello_mid, i32 0, i32 [[AND]] +; CHECK-NEXT: [[HELLO_L:%.*]] = call i32 @strlen(i8* [[HELLO_P]]) +; CHECK-NEXT: ret i32 [[HELLO_L]] +; + %and = and i32 %x, 15 + %hello_p = getelementptr inbounds [13 x i8], [13 x i8]* @null_hello_mid, i32 0, i32 %and + %hello_l = call i32 @strlen(i8* %hello_p) + ret i32 %hello_l +} + |
