From: Richard Earnshaw <rearnsha@arm.com>
Date: Mon, 31 Mar 2025 17:06:54 +0000 (+0100)
Subject: arm: select CCFPEmode for LTGT [PR91323]
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fe10ca6e3cf583640155812b230a0153ce4dc7b7;p=thirdparty%2Fgcc.git

arm: select CCFPEmode for LTGT [PR91323]

Besides Arm, there are three other ports that define both CCFPmode and
CCFPEmode.  AArch64 and Sparc return CCFPEmode for LTGT; the other,
Visium, doesn't support LTGT at all.

AArch64 was changed in r8-5286-g8332c5ee8c5f3b, and Sparc with
r10-2926-g000a5f8d23c04c.

I suspect this issue is latent on Arm because cbranch?f4 and cstore?f4
reject LTGT and UNEQ and we fall back to a generic expansion which
happens to work.  Nevertheless, this patch updates the relevant bits
of the Arm port to match the specification introduced in
r10-2926-g000a5f8d23c04c.

gcc/ChangeLog:

	PR target/91323
	* config/arm/arm.cc (arm_select_cc_mode): Use CCFPEmode for LTGT.
---

diff --git a/gcc/config/arm/arm.cc b/gcc/config/arm/arm.cc
index fccddb0e7bc..6bdb68aa788 100644
--- a/gcc/config/arm/arm.cc
+++ b/gcc/config/arm/arm.cc
@@ -16211,13 +16211,13 @@ arm_select_cc_mode (enum rtx_code op, rtx x, rtx y)
 	case UNGT:
 	case UNGE:
 	case UNEQ:
-	case LTGT:
 	  return CCFPmode;
 
 	case LT:
 	case LE:
 	case GT:
 	case GE:
+	case LTGT:
 	  return (flag_finite_math_only
 		  ? CCFPmode
 		  : CCFPEmode);