movw/movt never emitted

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March 20, 2017 at 13:48 #10718

pr242
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Hello,

I have noticed that gcc refuses to emit movt/movw pairs on an m3/m4/m7

It always generates ldr rx,[pc,#off] instead

I have tries all levels of optimization (gcc 5.2.0)

Has anyone noticed this?

March 20, 2017 at 14:32 #10719

pr242
Participant

Solved. It seems that gcc 5.2.0 has a new (secret …. !) option:

-mslow-flash-data

https://github.com/winksaville/gcc-5.2.0/blob/master/gcc/testsuite/gcc.target/arm/thumb2-slow-flash-data.c
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