1 ; RUN: llc < %s -march=x86-64 -mattr=+sse2 | FileCheck %s 2 3 ; This test makes sure that the compiler does not crash with an 4 ; assertion failure when trying to fold a vector shift left 5 ; by immediate count if the type of the input vector is different 6 ; to the result type. 7 ; 8 ; This happens for example when lowering a shift left of a MVT::v16i8 vector. 9 ; This is custom lowered into the following sequence: 10 ; count << 5 11 ; A = VSHLI(MVT::v8i16, r & (char16)15, 4) 12 ; B = BITCAST MVT::v16i8, A 13 ; VSELECT(r, B, count); 14 ; count += count 15 ; C = VSHLI(MVT::v8i16, r & (char16)63, 2) 16 ; D = BITCAST MVT::v16i8, C 17 ; r = VSELECT(r, C, count); 18 ; count += count 19 ; VSELECT(r, r+r, count); 20 ; count = count << 5; 21 ; 22 ; Where 'r' is a vector of type MVT::v16i8, and 23 ; 'count' is the vector shift count. 24 25 define <16 x i8> @do_not_crash(i8*, i32*, i64*, i32, i64, i8) { 26 entry: 27 store i8 %5, i8* %0 28 %L5 = load i8, i8* %0 29 %I8 = insertelement <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, i8 %L5, i32 7 30 %B51 = shl <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, %I8 31 ret <16 x i8> %B51 32 } 33 34 ; CHECK-LABEL: do_not_crash 35 ; CHECK: ret 36 37
