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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2014-06-19 01:13:40 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2014-06-19 01:13:40 +0200 |
| commit | 36bd0c3e42655cc235b1f7b041e2a198075a7ec3 (patch) | |
| tree | 0760c13d0611085d29e33cd4d7a29bcbc72809e3 /gcc | |
| parent | 74f4bbb732c22a2725fdc2fc8705a4cb46eeb477 (diff) | |
| download | gcc-36bd0c3e42655cc235b1f7b041e2a198075a7ec3.zip gcc-36bd0c3e42655cc235b1f7b041e2a198075a7ec3.tar.gz gcc-36bd0c3e42655cc235b1f7b041e2a198075a7ec3.tar.bz2 | |
rs6000: Make cr5 allocatable
A comment in rs6000.h says "cr5 is not supposed to be used". I checked
all ABIs, going as far back as PowerOpen (1994), and found no mention
of this.
Also document cr6 is used by some vector instructions.
From-SVN: r211811
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/rs6000/rs6000.h | 13 |
2 files changed, 12 insertions, 7 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a4a636d..76456542 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2014-06-18 Segher Boessenkool <segher@kernel.crashing.org> + + * config/rs6000/rs6000.h (FIXED_REGISTERS): Update comment. + Remove cr5. + (REG_ALLOC_ORDER): Update comment. Move cr5 earlier. + 2014-06-18 Kaz Kojima <kkojima@gcc.gnu.org> PR target/61550 diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h index 3bd0104..569ae2d 100644 --- a/gcc/config/rs6000/rs6000.h +++ b/gcc/config/rs6000/rs6000.h @@ -978,8 +978,6 @@ enum data_align { align_abi, align_opt, align_both }; On RS/6000, r1 is used for the stack. On Darwin, r2 is available as a local register; for all other OS's r2 is the TOC pointer. - cr5 is not supposed to be used. - On System V implementations, r13 is fixed and not available for use. */ #define FIXED_REGISTERS \ @@ -987,7 +985,7 @@ enum data_align { align_abi, align_opt, align_both }; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ - 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, \ + 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, \ /* AltiVec registers. */ \ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ @@ -1048,7 +1046,8 @@ enum data_align { align_abi, align_opt, align_both }; fp13 - fp2 (not saved; incoming fp arg registers) fp1 (not saved; return value) fp31 - fp14 (saved; order given to save least number) - cr7, cr6 (not saved or special) + cr7, cr5 (not saved or special) + cr6 (not saved, but used for vector operations) cr1 (not saved, but used for FP operations) cr0 (not saved, but used for arithmetic operations) cr4, cr3, cr2 (saved) @@ -1061,7 +1060,7 @@ enum data_align { align_abi, align_opt, align_both }; r12 (not saved; if used for DImode or DFmode would use r13) ctr (not saved; when we have the choice ctr is better) lr (saved) - cr5, r1, r2, ap, ca (fixed) + r1, r2, ap, ca (fixed) v0 - v1 (not saved or used for anything) v13 - v3 (not saved; incoming vector arg registers) v2 (not saved; incoming vector arg reg; return value) @@ -1099,14 +1098,14 @@ enum data_align { align_abi, align_opt, align_both }; 33, \ 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, \ 50, 49, 48, 47, 46, \ - 75, 74, 69, 68, 72, 71, 70, \ + 75, 73, 74, 69, 68, 72, 71, 70, \ MAYBE_R2_AVAILABLE \ 9, 10, 8, 7, 6, 5, 4, \ 3, EARLY_R12 11, 0, \ 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, \ 18, 17, 16, 15, 14, 13, LATE_R12 \ 66, 65, \ - 73, 1, MAYBE_R2_FIXED 67, 76, \ + 1, MAYBE_R2_FIXED 67, 76, \ /* AltiVec registers. */ \ 77, 78, \ 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, \ |