1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
; fastisel should not fold add with non-pointer bitwidth
; sext(a) + sext(b) != sext(a + b)
; RUN: llc -mtriple=x86_64-apple-darwin %s -O0 -o - | FileCheck %s
define zeroext i8 @gep_promotion(i8* %ptr) nounwind uwtable ssp {
entry:
%ptr.addr = alloca i8*, align 8
%add = add i8 64, 64 ; 0x40 + 0x40
%0 = load i8*, i8** %ptr.addr, align 8
; CHECK-LABEL: _gep_promotion:
; CHECK: movzbl ({{.*}})
%arrayidx = getelementptr inbounds i8, i8* %0, i8 %add
%1 = load i8, i8* %arrayidx, align 1
ret i8 %1
}
define zeroext i8 @gep_promotion_nonconst(i8 %i, i8* %ptr) nounwind uwtable ssp {
entry:
%i.addr = alloca i8, align 4
%ptr.addr = alloca i8*, align 8
store i8 %i, i8* %i.addr, align 4
store i8* %ptr, i8** %ptr.addr, align 8
%0 = load i8, i8* %i.addr, align 4
; CHECK-LABEL: _gep_promotion_nonconst:
; CHECK: movzbl ({{.*}})
%xor = xor i8 %0, -128 ; %0 ^ 0x80
%add = add i8 %xor, -127 ; %xor + 0x81
%1 = load i8*, i8** %ptr.addr, align 8
%arrayidx = getelementptr inbounds i8, i8* %1, i8 %add
%2 = load i8, i8* %arrayidx, align 1
ret i8 %2
}
|
