ae8eb7c877
and fix bugs - add-fp-model-options.patch: New file - enable-simd-math.patch: Enable simd math library in C and Fortran - fix-CTOR-vectorization.patch: New file - fix-range-set-by-vectorization-on-niter-IVs.patch: New file - medium-code-mode.patch: Fix bugs when used with fpic - optabs-Dont-use-scalar-conversions-for-vectors.patch: New file - PR92429-do-not-fold-when-updating.patch: New file - redundant-loop-elimination.patch: Fix some programming specifications - fix-ICE-in-vect.patch: New file - Fix-type-mismatch-in-SLPed-constructors.patch: New file - add-check-for-pressure-in-sche1.patch: New file - revert-moutline-atomics.patch: New file - fix-ICE-in-eliminate-stmt.patch: New file - revise-type-before-build-MULT.patch: New file - Simplify-X-C1-C2.patch: New file - gcc.spec: Add new patches
75 lines
2.4 KiB
Diff
75 lines
2.4 KiB
Diff
This backport contains 1 patch from gcc main stream tree.
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The commit id of these patchs list as following in the order of time.
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0001-tree-optimization-98117-fix-range-set-by-vectorizati.patch
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cdcbef3c3310a14f2994982b44cb1f8e14c77232
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diff --git a/gcc/testsuite/gcc.dg/torture/pr98117.c b/gcc/testsuite/gcc.dg/torture/pr98117.c
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new file mode 100644
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index 00000000000..f2160257263
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/torture/pr98117.c
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@@ -0,0 +1,19 @@
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+/* { dg-do run } */
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+/* { dg-additional-options "-fno-tree-scev-cprop" } */
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+
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+unsigned char c;
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+void __attribute__((noipa))
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+e()
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+{
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+ do
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+ {
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+ }
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+ while (++c);
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+}
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+int main()
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+{
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+ e();
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+ if (c != 0)
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+ __builtin_abort ();
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+ return 0;
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+}
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diff --git a/gcc/tree-vect-loop-manip.c b/gcc/tree-vect-loop-manip.c
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index 36179188f6d..2370b879b21 100644
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--- a/gcc/tree-vect-loop-manip.c
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+++ b/gcc/tree-vect-loop-manip.c
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@@ -2034,13 +2034,29 @@ vect_gen_vector_loop_niters (loop_vec_info loop_vinfo, tree niters,
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niters_vector = force_gimple_operand (niters_vector, &stmts, true, var);
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gsi_insert_seq_on_edge_immediate (pe, stmts);
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/* Peeling algorithm guarantees that vector loop bound is at least ONE,
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- we set range information to make niters analyzer's life easier. */
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+ we set range information to make niters analyzer's life easier.
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+ Note the number of latch iteration value can be TYPE_MAX_VALUE so
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+ we have to represent the vector niter TYPE_MAX_VALUE + 1 >> log_vf. */
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if (stmts != NULL && log_vf)
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- set_range_info (niters_vector, VR_RANGE,
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- wi::to_wide (build_int_cst (type, 1)),
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- wi::to_wide (fold_build2 (RSHIFT_EXPR, type,
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- TYPE_MAX_VALUE (type),
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- log_vf)));
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+ {
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+ if (niters_no_overflow)
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+ set_range_info (niters_vector, VR_RANGE,
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+ wi::one (TYPE_PRECISION (type)),
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+ wi::rshift (wi::max_value (TYPE_PRECISION (type),
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+ TYPE_SIGN (type)),
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+ exact_log2 (const_vf),
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+ TYPE_SIGN (type)));
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+ /* For VF == 1 the vector IV might also overflow so we cannot
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+ assert a minimum value of 1. */
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+ else if (const_vf > 1)
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+ set_range_info (niters_vector, VR_RANGE,
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+ wi::one (TYPE_PRECISION (type)),
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+ wi::rshift (wi::max_value (TYPE_PRECISION (type),
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+ TYPE_SIGN (type))
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+ - (const_vf - 1),
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+ exact_log2 (const_vf), TYPE_SIGN (type))
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+ + 1);
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+ }
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}
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*niters_vector_ptr = niters_vector;
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*step_vector_ptr = step_vector;
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--
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2.19.1
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