diff options
Diffstat (limited to 'toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch')
| -rw-r--r-- | toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch | 379 |
1 files changed, 187 insertions, 192 deletions
diff --git a/toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch b/toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch index 603c7f698..9337bf9ee 100644 --- a/toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch +++ b/toolchain/gcc/4.3.3/901-backport-fix-for-bug-32044.patch @@ -1,193 +1,188 @@ -Index: toolchain/gcc/4.3.2/901-backport-fix-for-bug-32044.patch +Index: gcc-4.3.2/gcc/tree-scalar-evolution.c =================================================================== ---- toolchain/gcc/4.3.2/901-backport-fix-for-bug-32044.patch (revision 0) -+++ toolchain/gcc/4.3.2/901-backport-fix-for-bug-32044.patch (revision 0) -@@ -0,0 +1,188 @@ -+Index: gcc-4.3.2/gcc/tree-scalar-evolution.c -+=================================================================== -+--- gcc-4.3.2.orig/gcc/tree-scalar-evolution.c 2009-01-28 10:14:37.000000000 +0100 -++++ gcc-4.3.2/gcc/tree-scalar-evolution.c 2009-01-28 10:17:50.000000000 +0100 -+@@ -2716,6 +2716,50 @@ -+ scalar_evolution_info = NULL; -+ } -+ -++/* Returns true if the expression EXPR is considered to be too expensive -++ for scev_const_prop. */ -++ -++bool -++expression_expensive_p (tree expr) -++{ -++ enum tree_code code; -++ -++ if (is_gimple_val (expr)) -++ return false; -++ -++ code = TREE_CODE (expr); -++ if (code == TRUNC_DIV_EXPR -++ || code == CEIL_DIV_EXPR -++ || code == FLOOR_DIV_EXPR -++ || code == ROUND_DIV_EXPR -++ || code == TRUNC_MOD_EXPR -++ || code == CEIL_MOD_EXPR -++ || code == FLOOR_MOD_EXPR -++ || code == ROUND_MOD_EXPR -++ || code == EXACT_DIV_EXPR) -++ { -++ /* Division by power of two is usually cheap, so we allow it. -++ Forbid anything else. */ -++ if (!integer_pow2p (TREE_OPERAND (expr, 1))) -++ return true; -++ } -++ -++ switch (TREE_CODE_CLASS (code)) -++ { -++ case tcc_binary: -++ case tcc_comparison: -++ if (expression_expensive_p (TREE_OPERAND (expr, 1))) -++ return true; -++ -++ /* Fallthru. */ -++ case tcc_unary: -++ return expression_expensive_p (TREE_OPERAND (expr, 0)); -++ -++ default: -++ return true; -++ } -++} -++ -+ /* Replace ssa names for that scev can prove they are constant by the -+ appropriate constants. Also perform final value replacement in loops, -+ in case the replacement expressions are cheap. -+@@ -2802,12 +2846,6 @@ -+ continue; -+ -+ niter = number_of_latch_executions (loop); -+- /* We used to check here whether the computation of NITER is expensive, -+- and avoided final value elimination if that is the case. The problem -+- is that it is hard to evaluate whether the expression is too -+- expensive, as we do not know what optimization opportunities the -+- the elimination of the final value may reveal. Therefore, we now -+- eliminate the final values of induction variables unconditionally. */ -+ if (niter == chrec_dont_know) -+ continue; -+ -+@@ -2838,7 +2876,15 @@ -+ /* Moving the computation from the loop may prolong life range -+ of some ssa names, which may cause problems if they appear -+ on abnormal edges. */ -+- || contains_abnormal_ssa_name_p (def)) -++ || contains_abnormal_ssa_name_p (def) -++ /* Do not emit expensive expressions. The rationale is that -++ when someone writes a code like -++ -++ while (n > 45) n -= 45; -++ -++ he probably knows that n is not large, and does not want it -++ to be turned into n %= 45. */ -++ || expression_expensive_p (def)) -+ continue; -+ -+ /* Eliminate the PHI node and replace it by a computation outside -+Index: gcc-4.3.2/gcc/tree-scalar-evolution.h -+=================================================================== -+--- gcc-4.3.2.orig/gcc/tree-scalar-evolution.h 2009-01-28 10:22:47.000000000 +0100 -++++ gcc-4.3.2/gcc/tree-scalar-evolution.h 2009-01-28 10:23:10.000000000 +0100 -+@@ -35,6 +35,7 @@ -+ extern void scev_analysis (void); -+ unsigned int scev_const_prop (void); -+ -++bool expression_expensive_p (tree); -+ extern bool simple_iv (struct loop *, tree, tree, affine_iv *, bool); -+ -+ /* Returns the loop of the polynomial chrec CHREC. */ -+Index: gcc-4.3.2/gcc/testsuite/gcc.dg/pr34027-1.c -+=================================================================== -+--- gcc-4.3.2.orig/gcc/testsuite/gcc.dg/pr34027-1.c 2009-01-28 10:24:09.000000000 +0100 -++++ gcc-4.3.2/gcc/testsuite/gcc.dg/pr34027-1.c 2009-01-28 10:24:43.000000000 +0100 -+@@ -8,5 +8,9 @@ -+ return ns; -+ } -+ -+-/* { dg-final { scan-tree-dump "ns % 10000" "optimized" } } */ -++/* This test was originally introduced to test that we transform -++ to ns % 10000. See the discussion of PR 32044 why we do not do -++ that anymore. */ -++/* { dg-final { scan-tree-dump-times "%" 0 "optimized" } } */ -++/* { dg-final { scan-tree-dump-times "/" 0 "optimized" } } */ -+ /* { dg-final { cleanup-tree-dump "optimized" } } */ -+Index: gcc-4.3.2/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c -+=================================================================== -+--- /dev/null 1970-01-01 00:00:00.000000000 +0000 -++++ gcc-4.3.2/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c 2009-01-28 10:25:50.000000000 +0100 -+@@ -0,0 +1,55 @@ -++/* { dg-do compile } */ -++/* { dg-options "-O2 -fdump-tree-empty -fdump-tree-final_cleanup" } */ -++ -++int foo (int n) -++{ -++ while (n >= 45) -++ n -= 45; -++ -++ return n; -++} -++ -++int bar (int n) -++{ -++ while (n >= 64) -++ n -= 64; -++ -++ return n; -++} -++ -++int bla (int n) -++{ -++ int i = 0; -++ -++ while (n >= 45) -++ { -++ i++; -++ n -= 45; -++ } -++ -++ return i; -++} -++ -++int baz (int n) -++{ -++ int i = 0; -++ -++ while (n >= 64) -++ { -++ i++; -++ n -= 64; -++ } -++ -++ return i; -++} -++ -++/* The loops computing division/modulo by 64 should be eliminated. */ -++/* { dg-final { scan-tree-dump-times "Removing empty loop" 2 "empty" } } */ -++ -++/* There should be no division/modulo in the final dump (division and modulo -++ by 64 are done using bit operations). */ -++/* { dg-final { scan-tree-dump-times "/" 0 "final_cleanup" } } */ -++/* { dg-final { scan-tree-dump-times "%" 0 "final_cleanup" } } */ -++ -++/* { dg-final { cleanup-tree-dump "empty" } } */ -++/* { dg-final { cleanup-tree-dump "final_cleanup" } } */ -+Index: gcc-4.3.2/gcc/tree-ssa-loop-ivopts.c -+=================================================================== -+--- gcc-4.3.2.orig/gcc/tree-ssa-loop-ivopts.c 2009-01-28 10:26:04.000000000 +0100 -++++ gcc-4.3.2/gcc/tree-ssa-loop-ivopts.c 2009-01-28 10:27:09.000000000 +0100 -+@@ -3778,7 +3778,12 @@ -+ return false; -+ -+ cand_value_at (loop, cand, use->stmt, nit, &bnd); -++ -+ *bound = aff_combination_to_tree (&bnd); -++ /* It is unlikely that computing the number of iterations using division -++ would be more profitable than keeping the original induction variable. */ -++ if (expression_expensive_p (*bound)) -++ return false; -+ return true; -+ } +--- gcc-4.3.2.orig/gcc/tree-scalar-evolution.c 2009-01-28 10:14:37.000000000 +0100 ++++ gcc-4.3.2/gcc/tree-scalar-evolution.c 2009-01-28 10:17:50.000000000 +0100 +@@ -2716,6 +2716,50 @@ + scalar_evolution_info = NULL; + } + ++/* Returns true if the expression EXPR is considered to be too expensive ++ for scev_const_prop. */ ++ ++bool ++expression_expensive_p (tree expr) ++{ ++ enum tree_code code; ++ ++ if (is_gimple_val (expr)) ++ return false; ++ ++ code = TREE_CODE (expr); ++ if (code == TRUNC_DIV_EXPR ++ || code == CEIL_DIV_EXPR ++ || code == FLOOR_DIV_EXPR ++ || code == ROUND_DIV_EXPR ++ || code == TRUNC_MOD_EXPR ++ || code == CEIL_MOD_EXPR ++ || code == FLOOR_MOD_EXPR ++ || code == ROUND_MOD_EXPR ++ || code == EXACT_DIV_EXPR) ++ { ++ /* Division by power of two is usually cheap, so we allow it. ++ Forbid anything else. */ ++ if (!integer_pow2p (TREE_OPERAND (expr, 1))) ++ return true; ++ } ++ ++ switch (TREE_CODE_CLASS (code)) ++ { ++ case tcc_binary: ++ case tcc_comparison: ++ if (expression_expensive_p (TREE_OPERAND (expr, 1))) ++ return true; ++ ++ /* Fallthru. */ ++ case tcc_unary: ++ return expression_expensive_p (TREE_OPERAND (expr, 0)); ++ ++ default: ++ return true; ++ } ++} ++ + /* Replace ssa names for that scev can prove they are constant by the + appropriate constants. Also perform final value replacement in loops, + in case the replacement expressions are cheap. +@@ -2802,12 +2846,6 @@ + continue; + + niter = number_of_latch_executions (loop); +- /* We used to check here whether the computation of NITER is expensive, +- and avoided final value elimination if that is the case. The problem +- is that it is hard to evaluate whether the expression is too +- expensive, as we do not know what optimization opportunities the +- the elimination of the final value may reveal. Therefore, we now +- eliminate the final values of induction variables unconditionally. */ + if (niter == chrec_dont_know) + continue; + +@@ -2838,7 +2876,15 @@ + /* Moving the computation from the loop may prolong life range + of some ssa names, which may cause problems if they appear + on abnormal edges. */ +- || contains_abnormal_ssa_name_p (def)) ++ || contains_abnormal_ssa_name_p (def) ++ /* Do not emit expensive expressions. The rationale is that ++ when someone writes a code like ++ ++ while (n > 45) n -= 45; ++ ++ he probably knows that n is not large, and does not want it ++ to be turned into n %= 45. */ ++ || expression_expensive_p (def)) + continue; + + /* Eliminate the PHI node and replace it by a computation outside +Index: gcc-4.3.2/gcc/tree-scalar-evolution.h +=================================================================== +--- gcc-4.3.2.orig/gcc/tree-scalar-evolution.h 2009-01-28 10:22:47.000000000 +0100 ++++ gcc-4.3.2/gcc/tree-scalar-evolution.h 2009-01-28 10:23:10.000000000 +0100 +@@ -35,6 +35,7 @@ + extern void scev_analysis (void); + unsigned int scev_const_prop (void); + ++bool expression_expensive_p (tree); + extern bool simple_iv (struct loop *, tree, tree, affine_iv *, bool); + + /* Returns the loop of the polynomial chrec CHREC. */ +Index: gcc-4.3.2/gcc/testsuite/gcc.dg/pr34027-1.c +=================================================================== +--- gcc-4.3.2.orig/gcc/testsuite/gcc.dg/pr34027-1.c 2009-01-28 10:24:09.000000000 +0100 ++++ gcc-4.3.2/gcc/testsuite/gcc.dg/pr34027-1.c 2009-01-28 10:24:43.000000000 +0100 +@@ -8,5 +8,9 @@ + return ns; + } + +-/* { dg-final { scan-tree-dump "ns % 10000" "optimized" } } */ ++/* This test was originally introduced to test that we transform ++ to ns % 10000. See the discussion of PR 32044 why we do not do ++ that anymore. */ ++/* { dg-final { scan-tree-dump-times "%" 0 "optimized" } } */ ++/* { dg-final { scan-tree-dump-times "/" 0 "optimized" } } */ + /* { dg-final { cleanup-tree-dump "optimized" } } */ +Index: gcc-4.3.2/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c +=================================================================== +--- /dev/null 1970-01-01 00:00:00.000000000 +0000 ++++ gcc-4.3.2/gcc/testsuite/gcc.dg/tree-ssa/pr32044.c 2009-01-28 10:25:50.000000000 +0100 +@@ -0,0 +1,55 @@ ++/* { dg-do compile } */ ++/* { dg-options "-O2 -fdump-tree-empty -fdump-tree-final_cleanup" } */ ++ ++int foo (int n) ++{ ++ while (n >= 45) ++ n -= 45; ++ ++ return n; ++} ++ ++int bar (int n) ++{ ++ while (n >= 64) ++ n -= 64; ++ ++ return n; ++} ++ ++int bla (int n) ++{ ++ int i = 0; ++ ++ while (n >= 45) ++ { ++ i++; ++ n -= 45; ++ } ++ ++ return i; ++} ++ ++int baz (int n) ++{ ++ int i = 0; ++ ++ while (n >= 64) ++ { ++ i++; ++ n -= 64; ++ } ++ ++ return i; ++} ++ ++/* The loops computing division/modulo by 64 should be eliminated. */ ++/* { dg-final { scan-tree-dump-times "Removing empty loop" 2 "empty" } } */ ++ ++/* There should be no division/modulo in the final dump (division and modulo ++ by 64 are done using bit operations). */ ++/* { dg-final { scan-tree-dump-times "/" 0 "final_cleanup" } } */ ++/* { dg-final { scan-tree-dump-times "%" 0 "final_cleanup" } } */ ++ ++/* { dg-final { cleanup-tree-dump "empty" } } */ ++/* { dg-final { cleanup-tree-dump "final_cleanup" } } */ +Index: gcc-4.3.2/gcc/tree-ssa-loop-ivopts.c +=================================================================== +--- gcc-4.3.2.orig/gcc/tree-ssa-loop-ivopts.c 2009-01-28 10:26:04.000000000 +0100 ++++ gcc-4.3.2/gcc/tree-ssa-loop-ivopts.c 2009-01-28 10:27:09.000000000 +0100 +@@ -3778,7 +3778,12 @@ + return false; + + cand_value_at (loop, cand, use->stmt, nit, &bnd); ++ + *bound = aff_combination_to_tree (&bnd); ++ /* It is unlikely that computing the number of iterations using division ++ would be more profitable than keeping the original induction variable. */ ++ if (expression_expensive_p (*bound)) ++ return false; + return true; + } |