69 lines
2.3 KiB
Diff
69 lines
2.3 KiB
Diff
From d6c7fe54314f7633d779da1a635a8f0832b8f4f6 Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Sat, 24 Sep 2022 20:47:22 +0800
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Subject: [PATCH 021/124] LoongArch: Use UNSPEC for fmin/fmax RTL pattern
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[PR105414]
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I made a mistake defining fmin/fmax RTL patterns in r13-2085: I used
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smin and smax in the definition mistakenly. This causes the optimizer
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to perform constant folding as if fmin/fmax was "really" smin/smax
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operations even with -fsignaling-nans. Then pr105414.c fails.
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We don't have fmin/fmax RTL codes for now (PR107013) so we can only use
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an UNSPEC for fmin and fmax patterns.
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gcc/ChangeLog:
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PR tree-optimization/105414
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* config/loongarch/loongarch.md (UNSPEC_FMAX): New unspec.
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(UNSPEC_FMIN): Likewise.
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(fmax<mode>3): Use UNSPEC_FMAX instead of smax.
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(fmin<mode>3): Use UNSPEC_FMIN instead of smin.
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Signed-off-by: Peng Fan <fanpeng@loongson.cn>
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Signed-off-by: ticat_fp <fanpeng@loongson.cn>
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---
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gcc/config/loongarch/loongarch.md | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
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index 3787fd823..214b14bdd 100644
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--- a/gcc/config/loongarch/loongarch.md
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+++ b/gcc/config/loongarch/loongarch.md
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@@ -35,6 +35,8 @@
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;; Floating point unspecs.
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UNSPEC_FRINT
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UNSPEC_FCLASS
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+ UNSPEC_FMAX
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+ UNSPEC_FMIN
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;; Override return address for exception handling.
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UNSPEC_EH_RETURN
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@@ -1032,8 +1034,9 @@
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(define_insn "fmax<mode>3"
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[(set (match_operand:ANYF 0 "register_operand" "=f")
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- (smax:ANYF (match_operand:ANYF 1 "register_operand" "f")
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- (match_operand:ANYF 2 "register_operand" "f")))]
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+ (unspec:ANYF [(use (match_operand:ANYF 1 "register_operand" "f"))
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+ (use (match_operand:ANYF 2 "register_operand" "f"))]
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+ UNSPEC_FMAX))]
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""
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"fmax.<fmt>\t%0,%1,%2"
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[(set_attr "type" "fmove")
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@@ -1041,8 +1044,9 @@
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(define_insn "fmin<mode>3"
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[(set (match_operand:ANYF 0 "register_operand" "=f")
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- (smin:ANYF (match_operand:ANYF 1 "register_operand" "f")
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- (match_operand:ANYF 2 "register_operand" "f")))]
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+ (unspec:ANYF [(use (match_operand:ANYF 1 "register_operand" "f"))
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+ (use (match_operand:ANYF 2 "register_operand" "f"))]
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+ UNSPEC_FMIN))]
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""
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"fmin.<fmt>\t%0,%1,%2"
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[(set_attr "type" "fmove")
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--
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2.33.0
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