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add tests to show missing optimization from D18230 

llvm-svn: 265431
This commit is contained in:
Sanjay Patel 2016-04-05 18:09:36 +00:00
parent 4064158ccc
commit fd16e62d56
1 changed files with 59 additions and 0 deletions
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59
llvm/test/Transforms/InstCombine/strlen-1.ll
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@ -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
}