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| author | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-01-29 19:27:51 +0000 |
|---|---|---|
| committer | amylaar <amylaar@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-01-29 19:27:51 +0000 |
| commit | a5c62b071b53129f32e6a14731c88c64e2b9d603 (patch) | |
| tree | 3d762db83b63c1342443ecbb937f28711135a950 /gcc/loop.c | |
| parent | e80e47c7f1c520eddc2302cb6ec34f07f5b0dcb8 (diff) | |
| download | gcc-a5c62b071b53129f32e6a14731c88c64e2b9d603.tar.gz | |
* loop.c (strength_reduce): Size reg_map according to reg_iv_type.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@24910 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index b0e7e87c923..109ededbba1 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -3666,6 +3666,7 @@ strength_reduce (scan_start, end, loop_top, insn_count, int threshold = (loop_has_call ? 1 : 2) * (3 + n_non_fixed_regs); /* Map of pseudo-register replacements. */ rtx *reg_map; + int reg_map_size; int call_seen; rtx test; rtx end_insert_before; @@ -4419,9 +4420,12 @@ strength_reduce (scan_start, end, loop_top, insn_count, so that "decrement and branch until zero" insn can be used. */ check_dbra_loop (loop_end, insn_count, loop_start, loop_info); - /* Create reg_map to hold substitutions for replaceable giv regs. */ - reg_map = (rtx *) alloca (max_reg_before_loop * sizeof (rtx)); - bzero ((char *) reg_map, max_reg_before_loop * sizeof (rtx)); + /* Create reg_map to hold substitutions for replaceable giv regs. + Some givs might have been made from biv increments, so look at + reg_iv_type for a suitable size. */ + reg_map_size = reg_iv_type->num_elements; + reg_map = (rtx *) alloca (reg_map_size * sizeof (rtx)); + bzero ((char *) reg_map, reg_map_size * sizeof (rtx)); /* Examine each iv class for feasibility of strength reduction/induction variable elimination. */ @@ -4962,8 +4966,8 @@ strength_reduce (scan_start, end, loop_top, insn_count, if (GET_CODE (p) == INSN || GET_CODE (p) == JUMP_INSN || GET_CODE (p) == CALL_INSN) { - replace_regs (PATTERN (p), reg_map, max_reg_before_loop, 0); - replace_regs (REG_NOTES (p), reg_map, max_reg_before_loop, 0); + replace_regs (PATTERN (p), reg_map, reg_map_size, 0); + replace_regs (REG_NOTES (p), reg_map, reg_map_size, 0); INSN_CODE (p) = -1; } |