| ;; X's live range extends beyond the shift, so the register allocator |
| ;; cannot coalesce 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: llc < %s -march=x86 -x86-asm-syntax=intel | \ |
| ; RUN: not grep {mov E.X, E.X} |
| |
| @G = external global i32 ; <i32*> [#uses=3] |
| |
| define i32 @test1(i32 %X, i32 %Y) { |
| %Z = add i32 %X, %Y ; <i32> [#uses=1] |
| volatile store i32 %Y, i32* @G |
| volatile store i32 %Z, i32* @G |
| ret i32 %X |
| } |
| |
| define i32 @test2(i32 %X) { |
| %Z = add i32 %X, 1 ; <i32> [#uses=1] |
| volatile store i32 %Z, i32* @G |
| ret i32 %X |
| } |
