diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 0069f78..fee3a2f 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -863,7 +863,7 @@ See RS/6000 and PowerPC Options. -mtune=@var{cpu-type} @gol -mcmodel=@var{code-model} @gol -m32 -m64 -mapp-regs -mno-app-regs @gol --mfaster-structs -mno-faster-structs @gol +-mfaster-structs -mno-faster-structs -mflat -mno-flat @gol -mfpu -mno-fpu -mhard-float -msoft-float @gol -mhard-quad-float -msoft-quad-float @gol -mlittle-endian @gol @@ -17043,6 +17043,19 @@ To be fully SVR4 ABI compliant at the cost of some performance loss, specify @option{-mno-app-regs}. You should compile libraries and system software with this option. +@item -mflat +@itemx -mno-flat +@opindex mflat +@opindex mno-flat +With @option{-mflat}, the compiler does not generate save/restore instructions +and uses a ``flat'' or single register window model. This model is compatible +with the regular register window model. The local registers and the input +registers (0--5) are still treated as ``call-saved'' registers and will be +saved on the stack as needed. + +With @option{-mno-flat} (the default), the compiler generates save/restore +instructions (except for leaf functions). This is the normal operating mode. + @item -mfpu @itemx -mhard-float @opindex mfpu |