| Sanjay Patel | baf0a24 | 2015-02-08 21:14:27 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -march=x86-64 -mattr=+sse2 | FileCheck %s |
| Andrea Di Biagio | 5448a3c | 2014-01-14 13:17:12 +0000 | [diff] [blame] | 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 |
| David Blaikie | a79ac14 | 2015-02-27 21:17:42 +0000 | [diff] [blame] | 28 | %L5 = load i8, i8* %0 |
| Andrea Di Biagio | 5448a3c | 2014-01-14 13:17:12 +0000 | [diff] [blame] | 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 | |