From fac15bf84807a58f83c741b1034c1bc96348319d Mon Sep 17 00:00:00 2001 From: Robin Dapp Date: Thu, 17 Feb 2022 19:59:51 +0100 Subject: [PATCH] rs6000: Workaround for new ifcvt behavior [PR104335]. Since r12-6747-gaa8cfe785953a0 ifcvt passes a "cc comparison" i.e. the representation of the result of a comparison to the backend. rs6000_emit_int_cmove () is not prepared to handle this. Therefore, this patch makes it return false in such a case. PR target/104335 gcc/ChangeLog: * config/rs6000/rs6000.cc (rs6000_emit_int_cmove): Return false if the expected comparison's first operand is of mode MODE_CC. --- gcc/config/rs6000/rs6000.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index e76c017..32a13cd 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -16215,6 +16215,12 @@ rs6000_emit_int_cmove (rtx dest, rtx op, rtx true_cond, rtx false_cond) if (mode != SImode && (!TARGET_POWERPC64 || mode != DImode)) return false; + /* PR104335: We now need to expect CC-mode "comparisons" + coming from ifcvt. The following code expects proper + comparisons so better abort here. */ + if (GET_MODE_CLASS (GET_MODE (XEXP (op, 0))) == MODE_CC) + return false; + /* We still have to do the compare, because isel doesn't do a compare, it just looks at the CRx bits set by a previous compare instruction. */ -- 2.7.4