1 ; fastisel should not fold add with non-pointer bitwidth 2 ; sext(a) + sext(b) != sext(a + b) 3 ; RUN: llc -mtriple=x86_64-apple-darwin %s -O0 -o - | FileCheck %s 4 5 define zeroext i8 @gep_promotion(i8* %ptr) nounwind uwtable ssp { 6 entry: 7 %ptr.addr = alloca i8*, align 8 8 %add = add i8 64, 64 ; 0x40 + 0x40 9 %0 = load i8** %ptr.addr, align 8 10 11 ; CHECK-LABEL: _gep_promotion: 12 ; CHECK: movzbl ({{.*}}) 13 %arrayidx = getelementptr inbounds i8* %0, i8 %add 14 15 %1 = load i8* %arrayidx, align 1 16 ret i8 %1 17 } 18 19 define zeroext i8 @gep_promotion_nonconst(i8 %i, i8* %ptr) nounwind uwtable ssp { 20 entry: 21 %i.addr = alloca i8, align 4 22 %ptr.addr = alloca i8*, align 8 23 store i8 %i, i8* %i.addr, align 4 24 store i8* %ptr, i8** %ptr.addr, align 8 25 %0 = load i8* %i.addr, align 4 26 ; CHECK-LABEL: _gep_promotion_nonconst: 27 ; CHECK: movzbl ({{.*}}) 28 %xor = xor i8 %0, -128 ; %0 ^ 0x80 29 %add = add i8 %xor, -127 ; %xor + 0x81 30 %1 = load i8** %ptr.addr, align 8 31 32 %arrayidx = getelementptr inbounds i8* %1, i8 %add 33 34 %2 = load i8* %arrayidx, align 1 35 ret i8 %2 36 } 37 38
