Rask Ingemann Lambertsen wrote:
Today, I had a look at the code I get for __gcc_bcmp() from libgcc2.c. I saw
a regression from
decw %ax
je .L2
to
movw %ax, %cx ; register allocation
decw %cx
movw %cx, %ax ; register allocation
andw %cx, %cx ; combine, decw sets condition codes
je .L2
Given this RTL in a life1 dump, shouldn't there be a LOG_LINKS field in insn
101 pointing back to insn 96?
Very shortly speaking, the semantics of how LOG_LINKS are set up are
very easy to mess up.
But isn't reg 32 dead, because it is only set by insn 98:
(insn 98 96 101 9 (set (reg/v:HI 32 [ size ])
(reg:HI 43)) 33 {movhi} (insn_list:REG_DEP_TRUE 96 (nil))
(nil))
after copyprop?
Paolo
