31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
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From fa28ce4ac91691595e14838be49c9dd42b153b7f Mon Sep 17 00:00:00 2001
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From: Guo Jie <guojie@loongson.cn>
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Date: Thu, 23 Nov 2023 11:05:56 +0800
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Subject: [PATCH 045/188] LoongArch: Fix runtime error in a gcc build with
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--with-build-config=bootstrap-ubsan
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gcc/ChangeLog:
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* config/loongarch/loongarch.cc (loongarch_split_plus_constant):
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avoid left shift of negative value -0x8000.
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---
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gcc/config/loongarch/loongarch.cc | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
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index 048d3802b..ecceca22d 100644
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--- a/gcc/config/loongarch/loongarch.cc
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+++ b/gcc/config/loongarch/loongarch.cc
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@@ -4265,7 +4265,7 @@ loongarch_split_plus_constant (rtx *op, machine_mode mode)
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else if (loongarch_addu16i_imm12_operand_p (v, mode))
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a = (v & ~HWIT_UC_0xFFF) + ((v & 0x800) << 1);
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else if (mode == DImode && DUAL_ADDU16I_OPERAND (v))
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- a = (v > 0 ? 0x7fff : -0x8000) << 16;
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+ a = (v > 0 ? 0x7fff0000 : ~0x7fffffff);
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else
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gcc_unreachable ();
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--
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2.43.0
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