Florent DEFAY schrieb:
Hi,
I am working on a new port for a 16bits target, 8 registers.
When compiling libgcc2.c I get this error:
../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c: In function ‘__mulsi3’:
../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c:566: error: insn does not
satisfy its constraints:
(insn 122 171 102 ../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c:565 (set
(mem/c/i:HI (plus:HI (mem/f/c/i:HI (plus:HI (reg/f:HI 5 r5)
(const_int 2 [0x2])) [0 D.2445+0 S2 A16])
(const_int 2 [0x2])) [0 <result>+2 S2 A16])
(reg:HI 0 r0)) 5 {movhi} (nil))
../../../gcc-4.3.3/libgcc/../gcc/libgcc2.c:566: internal compiler
error: in final_scan_insn, at final.c:2548
According to my GO_IF_LEGITIMATE_ADDRESS, this RTL should not exist.
Is it possible that there are not enough registers in the machine ?
This macro and some others like REGNO_OK_FOR_BASE_P have two flavours:
strict (for strict RTL) and non-strict (for non-strict RTL).
Strict versions must disallow pseudos that have no hard regs assigned.
When gcc runs out of regs it puts values in stack slots: the reg is
replaced with a mem in reload pass.
Georg-Johann
