19 lines
836 B
Diff
19 lines
836 B
Diff
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
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index 5e3236f..7035504 100644
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--- a/gcc/config/m68k/m68k.c
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+++ b/gcc/config/m68k/m68k.c
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@@ -4209,6 +4209,13 @@ notice_update_cc (rtx exp, rtx insn)
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&& cc_status.value2
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&& reg_overlap_mentioned_p (cc_status.value1, cc_status.value2))
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cc_status.value2 = 0;
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+ /* Check for PRE_DEC in dest modifying a register used in src. */
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+ if (cc_status.value1 && GET_CODE (cc_status.value1) == MEM
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+ && GET_CODE (XEXP (cc_status.value1, 0)) == PRE_DEC
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+ && cc_status.value2
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+ && reg_overlap_mentioned_p (XEXP (XEXP (cc_status.value1, 0), 0),
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+ cc_status.value2))
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+ cc_status.value2 = 0;
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if (((cc_status.value1 && FP_REG_P (cc_status.value1))
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|| (cc_status.value2 && FP_REG_P (cc_status.value2))))
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cc_status.flags = CC_IN_68881;
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