| Chris Lattner | ae37c2a | 2005-01-02 02:30:04 +0000 | [diff] [blame] | 1 | ;; X's live range extends beyond the shift, so the register allocator |
| Chris Lattner | 52da884 | 2006-03-24 07:13:29 +0000 | [diff] [blame] | 2 | ;; cannot coalesce it with Y. Because of this, a copy needs to be |
| Chris Lattner | ae37c2a | 2005-01-02 02:30:04 +0000 | [diff] [blame] | 3 | ;; emitted before the shift to save the register value before it is |
| 4 | ;; clobbered. However, this copy is not needed if the register |
| 5 | ;; allocator turns the shift into an LEA. This also occurs for ADD. |
| 6 | |
| 7 | ; Check that the shift gets turned into an LEA. |
| 8 | |
| Chris Lattner | d065c81 | 2006-05-01 05:56:51 +0000 | [diff] [blame] | 9 | ; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov E.X, E.X' |
| Chris Lattner | ae37c2a | 2005-01-02 02:30:04 +0000 | [diff] [blame] | 10 | |
| Chris Lattner | ae37c2a | 2005-01-02 02:30:04 +0000 | [diff] [blame] | 11 | %G = external global int |
| 12 | |
| 13 | int %test1(int %X) { |
| 14 | %Z = shl int %X, ubyte 2 |
| 15 | volatile store int %Z, int* %G |
| 16 | ret int %X |
| 17 | } |