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From: Ivo R. <ir...@so...> - 2017-12-13 16:01:40
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=3a5c5cecbd44b2daea146eeb5109d2b96353ef6d commit 3a5c5cecbd44b2daea146eeb5109d2b96353ef6d Author: Ivo Raisr <iv...@iv...> Date: Wed Dec 13 16:59:03 2017 +0100 Remove compiler warning about possibly uninitialized variable. This happened only with quite an old gcc version. Anyway, this commit simplifies the situation a bit. Diff: --- VEX/priv/host_generic_reg_alloc3.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/VEX/priv/host_generic_reg_alloc3.c b/VEX/priv/host_generic_reg_alloc3.c index 0d35c62..e6908ce 100644 --- a/VEX/priv/host_generic_reg_alloc3.c +++ b/VEX/priv/host_generic_reg_alloc3.c @@ -41,6 +41,7 @@ #define INVALID_INSTRNO (-2) +#define INVALID_INDEX (-2) /* Register allocator state is kept in an array of VRegState's. There is an element for every virtual register (vreg). @@ -414,14 +415,14 @@ static inline HReg find_vreg_to_spill( An ideal rreg candidate is a caller-save register for short-lived vregs and a callee-save register for long-lived vregs because it won't need to be spilled around helper calls. */ -static Bool find_free_rreg( +static Int find_free_rreg( const VRegState* vreg_state, UInt n_vregs, const RRegState* rreg_state, UInt n_rregs, const RRegLRState* rreg_lr_state, UInt v_idx, UInt current_ii, HRegClass target_hregclass, - Bool reserve_phase, const RegAllocControl* con, UInt* r_idx_found) + Bool reserve_phase, const RegAllocControl* con) { - Bool found = False; + Int r_idx_found = INVALID_INDEX; UInt distance_so_far = 0; /* running max for |live_after - current_ii| */ const VRegState* vreg = &vreg_state[v_idx]; @@ -433,27 +434,23 @@ static Bool find_free_rreg( const RRegLRState* rreg_lrs = &rreg_lr_state[r_idx]; if (rreg->disp == Free) { if (rreg_lrs->lrs_used == 0) { - found = True; - *r_idx_found = r_idx; + r_idx_found = r_idx; break; /* There could be nothing better, so break now. */ } else { const RRegLR* lr = rreg_lrs->lr_current; if (lr->live_after > (Short) current_ii) { /* RReg's hard live range is not live, yet. */ if (vreg->effective_dead_before <= lr->live_after) { - found = True; - *r_idx_found = r_idx; + r_idx_found = r_idx; break; /* VReg is short-lived; it fits in. */ } if ((lr->live_after - (Short) current_ii) > distance_so_far) { distance_so_far = lr->live_after - (Short) current_ii; - found = True; - *r_idx_found = r_idx; + r_idx_found = r_idx; } } else if ((Short) current_ii >= lr->dead_before) { /* Now dead. Effectively as if there is no LR now. */ - found = True; - *r_idx_found = r_idx; + r_idx_found = r_idx; break; /* There could be nothing better, so break now. */ } else { /* Going live for this instruction. This could happen only when @@ -465,7 +462,7 @@ static Bool find_free_rreg( } } - return found; + return r_idx_found; } /* A target-independent register allocator (v3). Requires various functions @@ -556,12 +553,10 @@ HInstrArray* doRegisterAllocation_v3( instruction and makes free the corresponding rreg. */ # define FIND_OR_MAKE_FREE_RREG(_ii, _v_idx, _reg_class, _reserve_phase) \ ({ \ - UInt _r_free_idx; \ - Bool free_rreg_found = find_free_rreg( \ + Int _r_free_idx = find_free_rreg( \ vreg_state, n_vregs, rreg_state, n_rregs, rreg_lr_state, \ - (_v_idx), (_ii), (_reg_class), (_reserve_phase), \ - con, &_r_free_idx); \ - if (!free_rreg_found) { \ + (_v_idx), (_ii), (_reg_class), (_reserve_phase), con); \ + if (_r_free_idx == INVALID_INDEX) { \ HReg vreg_to_spill = find_vreg_to_spill( \ vreg_state, n_vregs, rreg_state, n_rregs, \ ®_usage[(_ii)], (_reg_class), \ |