From 42bc589e87a326282be2156ddeb18588677c645d Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Wed, 11 Mar 2020 10:54:22 +0100 Subject: [PATCH] aarch64: Fix ICE in aarch64_add_offset_1 [PR94121] abs_hwi asserts that the argument is not HOST_WIDE_INT_MIN and as the (invalid) testcase shows, the function can be called with such an offset. The following patch is IMHO minimal fix, absu_hwi unlike abs_hwi allows even that value and will return (unsigned HOST_WIDE_INT) HOST_WIDE_INT_MIN in that case. The function then uses moffset in two spots which wouldn't care if the value is (unsigned HOST_WIDE_INT) HOST_WIDE_INT_MIN or HOST_WIDE_INT_MIN and wouldn't accept it (!moffset and aarch64_uimm12_shift (moffset)), then in one spot where the signedness of moffset does matter and using unsigned is the right thing - moffset < 0x1000000 - and finally has code which will handle even this value right; the assembler doesn't really care for DImode immediates if mov x1, -9223372036854775808 or mov x1, 9223372036854775808 is used and similarly it doesn't matter if we add or sub it in DImode. 2020-03-11 Jakub Jelinek PR target/94121 * config/aarch64/aarch64.c (aarch64_add_offset_1): Use absu_hwi instead of abs_hwi, change moffset type to unsigned HOST_WIDE_INT. * gcc.dg/pr94121.c: New test. --- gcc/ChangeLog | 4 ++++ gcc/config/aarch64/aarch64.c | 2 +- gcc/testsuite/ChangeLog | 3 +++ gcc/testsuite/gcc.dg/pr94121.c | 16 ++++++++++++++++ 4 files changed, 24 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/pr94121.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e4b74dd..1fc6ff3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,9 @@ 2020-03-11 Jakub Jelinek + PR target/94121 + * config/aarch64/aarch64.c (aarch64_add_offset_1): Use absu_hwi + instead of abs_hwi, change moffset type to unsigned HOST_WIDE_INT. + PR bootstrap/93962 * value-prof.c (dump_histogram_value): Use abs_hwi instead of std::abs. diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 4b9747b..c320d5ba 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -3713,7 +3713,7 @@ aarch64_add_offset_1 (scalar_int_mode mode, rtx dest, gcc_assert (emit_move_imm || temp1 != NULL_RTX); gcc_assert (temp1 == NULL_RTX || !reg_overlap_mentioned_p (temp1, src)); - HOST_WIDE_INT moffset = abs_hwi (offset); + unsigned HOST_WIDE_INT moffset = absu_hwi (offset); rtx_insn *insn; if (!moffset) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 3a4acce..af94cb4 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,5 +1,8 @@ 2020-03-11 Jakub Jelinek + PR target/94121 + * gcc.dg/pr94121.c: New test. + PR middle-end/94111 * gcc.dg/dfp/pr94111.c: New test. diff --git a/gcc/testsuite/gcc.dg/pr94121.c b/gcc/testsuite/gcc.dg/pr94121.c new file mode 100644 index 0000000..2a4261a --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr94121.c @@ -0,0 +1,16 @@ +/* PR target/94121 */ +/* { dg-do compile { target pie } } */ +/* { dg-options "-O2 -fpie -w" } */ + +#define DIFF_MAX __PTRDIFF_MAX__ +#define DIFF_MIN (-DIFF_MAX - 1) + +extern void foo (char *); +extern char v[]; + +void +bar (void) +{ + char *p = v; + foo (&p[DIFF_MIN]); +} -- 2.7.4