124 lines
3.7 KiB
Diff
124 lines
3.7 KiB
Diff
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From 2ae587a86bba31b91a127e353c31c9f861ff5326 Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Tue, 8 Nov 2022 13:42:20 +0800
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Subject: [PATCH 030/124] LoongArch: Add flogb.{s,d} instructions and expand
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logb{sf,df}2
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On LoongArch, flogb instructions extract the exponent of a non-negative
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floating point value, but produces NaN for negative values. So we need
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to add a fabs instruction when we expand logb.
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gcc/ChangeLog:
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* config/loongarch/loongarch.md (UNSPEC_FLOGB): New unspec.
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(type): Add flogb.
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(logb_non_negative<mode>2): New instruction template.
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(logb<mode>2): New define_expand.
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gcc/testsuite/ChangeLog:
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* gcc.target/loongarch/flogb.c: New test.
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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 | 35 ++++++++++++++++++++--
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gcc/testsuite/gcc.target/loongarch/flogb.c | 18 +++++++++++
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2 files changed, 51 insertions(+), 2 deletions(-)
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create mode 100644 gcc/testsuite/gcc.target/loongarch/flogb.c
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diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
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index c141c9add..682ab9617 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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@@ -42,6 +42,7 @@
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UNSPEC_FTINTRM
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UNSPEC_FTINTRP
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UNSPEC_FSCALEB
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+ UNSPEC_FLOGB
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;; Override return address for exception handling.
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UNSPEC_EH_RETURN
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@@ -217,6 +218,7 @@
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;; fdiv floating point divide
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;; frdiv floating point reciprocal divide
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;; fabs floating point absolute value
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+;; flogb floating point exponent extract
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;; fneg floating point negation
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;; fcmp floating point compare
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;; fcopysign floating point copysign
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@@ -233,8 +235,8 @@
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"unknown,branch,jump,call,load,fpload,fpidxload,store,fpstore,fpidxstore,
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prefetch,prefetchx,condmove,mgtf,mftg,const,arith,logical,
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shift,slt,signext,clz,trap,imul,idiv,move,
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- fmove,fadd,fmul,fmadd,fdiv,frdiv,fabs,fneg,fcmp,fcopysign,fcvt,fscaleb,
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- fsqrt,frsqrt,accext,accmod,multi,atomic,syncloop,nop,ghost"
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+ fmove,fadd,fmul,fmadd,fdiv,frdiv,fabs,flogb,fneg,fcmp,fcopysign,fcvt,
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+ fscaleb,fsqrt,frsqrt,accext,accmod,multi,atomic,syncloop,nop,ghost"
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(cond [(eq_attr "jirl" "!unset") (const_string "call")
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(eq_attr "got" "load") (const_string "load")
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@@ -1039,6 +1041,35 @@
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(set_attr "mode" "<UNITMODE>")])
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;;
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+;; ....................
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+;;
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+;; FLOATING POINT EXPONENT EXTRACT
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+;;
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+;; ....................
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+
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+(define_insn "logb_non_negative<mode>2"
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+ [(set (match_operand:ANYF 0 "register_operand" "=f")
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+ (unspec:ANYF [(match_operand:ANYF 1 "register_operand" "f")]
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+ UNSPEC_FLOGB))]
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+ "TARGET_HARD_FLOAT"
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+ "flogb.<fmt>\t%0,%1"
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+ [(set_attr "type" "flogb")
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+ (set_attr "mode" "<UNITMODE>")])
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+
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+(define_expand "logb<mode>2"
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+ [(set (match_operand:ANYF 0 "register_operand")
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+ (unspec:ANYF [(abs:ANYF (match_operand:ANYF 1 "register_operand"))]
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+ UNSPEC_FLOGB))]
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+ "TARGET_HARD_FLOAT"
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+{
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+ rtx tmp = gen_reg_rtx (<MODE>mode);
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+
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+ emit_insn (gen_abs<mode>2 (tmp, operands[1]));
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+ emit_insn (gen_logb_non_negative<mode>2 (operands[0], tmp));
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+ DONE;
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+})
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+
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+;;
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;; ...................
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;;
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;; Count leading zeroes.
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diff --git a/gcc/testsuite/gcc.target/loongarch/flogb.c b/gcc/testsuite/gcc.target/loongarch/flogb.c
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new file mode 100644
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index 000000000..1daefe54e
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/loongarch/flogb.c
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@@ -0,0 +1,18 @@
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+/* { dg-do compile } */
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+/* { dg-options "-mdouble-float -fno-math-errno" } */
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+/* { dg-final { scan-assembler "fabs\\.s" } } */
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+/* { dg-final { scan-assembler "fabs\\.d" } } */
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+/* { dg-final { scan-assembler "flogb\\.s" } } */
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+/* { dg-final { scan-assembler "flogb\\.d" } } */
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+
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+double
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+my_logb (double a)
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+{
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+ return __builtin_logb (a);
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+}
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+
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+float
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+my_logbf (float a)
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+{
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+ return __builtin_logbf (a);
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+}
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--
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2.33.0
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