Re: [x86 PATCH] PR target/106122: Don't update %esp via the stack with -Oz.

2022-06-30 Thread Uros Bizjak via Gcc-patches
On Fri, Jul 1, 2022 at 1:00 AM Roger Sayle wrote: > > > When optimizing for size with -Oz, setting a register can be minimized by > pushing an immediate value to the stack and popping it to the destination. > Alas the one general register that shouldn't be updated via the stack is > the stack poin

[x86 PATCH] PR target/106122: Don't update %esp via the stack with -Oz.

2022-06-30 Thread Roger Sayle
When optimizing for size with -Oz, setting a register can be minimized by pushing an immediate value to the stack and popping it to the destination. Alas the one general register that shouldn't be updated via the stack is the stack pointer itself, where "pop %esp" can't be represented in GCC's RTL