import gcc-8.5.0-10.el8
This commit is contained in:
CentOS Sources
Stepan Oksanichenko
parent
423c10d13d
commit
6a8a66e376
101
SOURCES/gcc8-rh2028609.patch
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101
SOURCES/gcc8-rh2028609.patch
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@ -0,0 +1,101 @@
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The cprop_hardreg pass is built around the assumption that accessing a
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register in a narrower mode is the same as accessing the lowpart of
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the register. This unfortunately is not true for vector registers on
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IBM Z. This caused a miscompile of LLVM with GCC 8.5. The problem
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could not be reproduced with upstream GCC unfortunately but we have to
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assume that it is latent there. The right fix would require
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substantial changes to the cprop pass and is certainly something we
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would want for our platform. But since this would not be acceptable
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for older GCCs I'll go with what Vladimir proposed in the RedHat BZ
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and introduce a hopefully temporary and undocumented target hook to
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disable that specific transformation in regcprop.c.
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--- a/gcc/config/s390/s390.c
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+++ b/gcc/config/s390/s390.c
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@@ -10488,6 +10488,18 @@ s390_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
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return false;
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}
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+/* Implement TARGET_NARROW_MODE_REFERS_LOW_PART_P. */
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+
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+static bool
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+s390_narrow_mode_refers_low_part_p (unsigned int regno)
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+{
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+ if (reg_classes_intersect_p (VEC_REGS, REGNO_REG_CLASS (regno)))
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+ return false;
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+
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+ return true;
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+}
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+
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+
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/* Implement TARGET_MODES_TIEABLE_P. */
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static bool
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@@ -16956,6 +16968,9 @@ s390_case_values_threshold (void)
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#undef TARGET_CASE_VALUES_THRESHOLD
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#define TARGET_CASE_VALUES_THRESHOLD s390_case_values_threshold
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+#undef TARGET_NARROW_MODE_REFERS_LOW_PART_P
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+#define TARGET_NARROW_MODE_REFERS_LOW_PART_P s390_narrow_mode_refers_low_part_p
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+
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struct gcc_target targetm = TARGET_INITIALIZER;
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#include "gt-s390.h"
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--- a/gcc/regcprop.c
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+++ b/gcc/regcprop.c
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@@ -426,7 +426,8 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
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if (orig_mode == new_mode)
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return gen_raw_REG (new_mode, regno);
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- else if (mode_change_ok (orig_mode, new_mode, regno))
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+ else if (mode_change_ok (orig_mode, new_mode, regno)
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+ && targetm.narrow_mode_refers_low_part_p (copy_regno))
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{
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int copy_nregs = hard_regno_nregs (copy_regno, copy_mode);
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int use_nregs = hard_regno_nregs (copy_regno, new_mode);
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--- a/gcc/target.def
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+++ b/gcc/target.def
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@@ -5446,6 +5446,16 @@ value that the middle-end intended.",
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bool, (machine_mode from, machine_mode to, reg_class_t rclass),
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hook_bool_mode_mode_reg_class_t_true)
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+/* This hook is used to work around a problem in regcprop. Hardcoded
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+assumptions currently prevent it from working correctly for targets
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+where the low part of a multi-word register doesn't align to accessing
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+the register with a narrower mode. */
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+DEFHOOK_UNDOC
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+(narrow_mode_refers_low_part_p,
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+"",
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+bool, (unsigned int regno),
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+hook_bool_uint_true)
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+
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/* Change pseudo allocno class calculated by IRA. */
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DEFHOOK
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(ira_change_pseudo_allocno_class,
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--- a/gcc/hooks.h
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+++ b/gcc/hooks.h
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@@ -86,6 +86,7 @@ extern void hook_void_tree (tree);
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extern void hook_void_tree_treeptr (tree, tree *);
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extern void hook_void_int_int (int, int);
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extern void hook_void_gcc_optionsp (struct gcc_options *);
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+extern bool hook_bool_uint_true (unsigned int);
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extern bool hook_bool_uint_uintp_false (unsigned int, unsigned int *);
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extern int hook_int_uint_mode_1 (unsigned int, machine_mode);
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--- a/gcc/hooks.c
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+++ b/gcc/hooks.c
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@@ -498,6 +498,14 @@ hook_void_gcc_optionsp (struct gcc_optio
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{
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}
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+/* Generic hook that takes an unsigned int and returns true. */
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+
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+bool
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+hook_bool_uint_true (unsigned int)
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+{
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+ return true;
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+}
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+
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/* Generic hook that takes an unsigned int, an unsigned int pointer and
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returns false. */
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@ -4,7 +4,7 @@
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%global gcc_major 8
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# Note, gcc_release must be integer, if you want to add suffixes to
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# %%{release}, append them after %%{gcc_release} on Release: line.
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%global gcc_release 8
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%global gcc_release 10
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%global nvptx_tools_gitrev c28050f60193b3b95a18866a96f03334e874e78f
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%global nvptx_newlib_gitrev aadc8eb0ec43b7cd0dd2dfb484bae63c8b05ef24
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%global _unpackaged_files_terminate_build 0
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@ -283,6 +283,7 @@ Patch22: gcc8-Wbidi-chars.patch
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Patch23: gcc8-pr96796.patch
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Patch24: gcc8-pch-tweaks.patch
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Patch25: gcc8-aarch64-mtune-neoverse-512tvb.patch
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Patch26: gcc8-rh2028609.patch
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Patch30: gcc8-rh1668903-1.patch
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Patch31: gcc8-rh1668903-2.patch
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@ -867,6 +868,7 @@ to NVidia PTX capable devices if available.
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%patch23 -p1 -b .pr96796~
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%patch24 -p1 -b .pch-tweaks~
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%patch25 -p1 -b .neoverse~
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%patch26 -p1 -b .rh2028609~
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%patch30 -p0 -b .rh1668903-1~
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%patch31 -p0 -b .rh1668903-2~
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@ -3183,6 +3185,12 @@ fi
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%endif
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%changelog
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* Thu Jan 27 2022 Marek Polacek <polacek@redhat.com> 8.5.0-10
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- fix typo in the cprop_hardreg patch (#2028609)
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* Mon Jan 24 2022 Marek Polacek <polacek@redhat.com> 8.5.0-9
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- apply cprop_hardreg fix for narrow mode != lowpart targets (#2028609)
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* Mon Jan 24 2022 Marek Polacek <polacek@redhat.com> 8.5.0-8
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- aarch64: Add -mtune=neoverse-512tvb (#1845932)
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