On 30/11/16 17:32, Wilco Dijkstra wrote:
> Thumb uses a special register allocation order to increase the use of low
> registers. Oddly enough, LR appears before R12, which means that LR must
> be saved and restored even if R12 is available. Swapping R12 and LR means
> this simple example now use
ping
From: Wilco Dijkstra
Sent: 30 November 2016 17:32
To: GCC Patches
Cc: nd
Subject: [PATCH][ARM] Improve Thumb allocation order
Thumb uses a special register allocation order to increase the use of low
registers. Oddly enough, LR appears before R12, which means that LR must
be
ping
From: Wilco Dijkstra
Sent: 30 November 2016 17:32
To: GCC Patches
Cc: nd
Subject: [PATCH][ARM] Improve Thumb allocation order
Thumb uses a special register allocation order to increase the use of low
registers. Oddly enough, LR appears before R12, which means that LR must
be saved
Thumb uses a special register allocation order to increase the use of low
registers. Oddly enough, LR appears before R12, which means that LR must
be saved and restored even if R12 is available. Swapping R12 and LR means
this simple example now uses R12 as a temporary (just like ARM):
int f(long
