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Replace manual SFR_DATA_0 and SFR_DATA_8 pair read and write with SFR_DATA_U16.

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Also added SFR_SMI_REG_U16.

Doing pval = reg_h; pval <<= 8; pval |= reg_l; dont always optimized by the compiler a some places, not all.

A snipped of the diff between two .asm files.

5414,5424c5414,5416
< ;     rtlplayground.c:1382: uint16_t pval = SFR_DATA_8;
< ;     rtlplayground.c:1383: pval <<= 8;
<       mov     r7,_SFR_DATA_8
<       mov     r6,#0x00
< ;     rtlplayground.c:1384: pval |= SFR_DATA_0;
<       mov     r4,_SFR_DATA_0
<       mov     r5,#0x00
<       mov     a,r6
<       orl     ar4,a
<       mov     a,r7
<       orl     ar5,a
---
> ;     rtlplayground.c:1382: uint16_t pval = SFR_DATA_U16;
>       mov     r6,((_SFR_DATA_U16 >> 0) & 0xFF)
>       mov     r7,((_SFR_DATA_U16 >> 8) & 0xFF)
This commit is contained in:
René van Dorst
2025-09-01 09:20:36 +02:00
committed by René van Dorst
parent 9dafeab490
commit b8928a8bcd
2 changed files with 19 additions and 23 deletions
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rtl837x_sfr.h
+1
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@@ -21,6 +21,7 @@ __sfr __at(0xa7) SFR_DATA_0;
#define SFR_EXEC_WRITE_SMI 11
/* SFR control registers for phy access via SMI/MDIO */
__sfr16 __at(0xc2c3) SFR_SMI_REG_U16;
__sfr __at(0xc2) SFR_SMI_REG_H;
__sfr __at(0xc3) SFR_SMI_REG_L;
__sfr __at(0xc4) SFR_SMI_DEV;