RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
Table 4-16 Named registers available on ARM architecture-based processors
Register
r13 or sp
r14 or lr
r15 or pc
Character string for __asm
"r13" or "sp"
"r14" or "lr"
"r15" or "pc".
On targets with a VFP, the registers of Table 4-17 are also available for
use with named register variables.
Table 4-17 Named registers available on targets with a VFP
Register
Character string for __asm
FPSID "fpsid"
FPSCR "fpscr"
FPEXC "fpexc"
Example
void foo(void)
{
register int foo __asm("r0");
}
In this example, foo is declared as a named register variable for the register r0.
See also
• Named register variables on page 3-9 in the Compiler User Guide.
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