| ;; X's live range extends beyond the shift, so the register allocator |
| ;; cannot coallesce it with Y. Because of this, a copy needs to be |
| ;; emitted before the shift to save the register value before it is |
| ;; clobbered. However, this copy is not needed if the register |
| ;; allocator turns the shift into an LEA. This also occurs for ADD. |
| |
| ; Check that the shift gets turned into an LEA. |
| |
| ; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X' |
| |
| ; FIXME: We need live variable information about flags to do this xform safely. :( |
| ; XFAIL: * |
| |
| %G = external global int |
| |
| int %test1(int %X, int %Y) { |
| %Z = add int %X, %Y |
| volatile store int %Y, int* %G |
| volatile store int %Z, int* %G |
| ret int %X |
| } |
| |
| int %test2(int %X) { |
| %Z = add int %X, 1 ;; inc |
| volatile store int %Z, int* %G |
| ret int %X |
| } |
