[PATCH, csky] Handle -frounding-math.

[瞿仙淼]

Hi, 
        I have submitted a patch to handle -frounding-math for C-SKY


Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog       (revision 266023)
+++ gcc/ChangeLog       (working copy)
@@ -1,3 +1,8 @@
+2018-11-11  Xianmiao Qu  <xianmiao...@c-sky.com>
+
+       * config/csky/csky.md (*fpuv2_nmulsf3_1, *fpuv2_nmuldf3_1): Handle
+       -frounding-math.
+
 2018-11-11  Sandra Loosemore  <san...@codesourcery.com>
 
        PR c++/43105
Index: gcc/config/csky/csky_insn_fpu.md
===================================================================
--- gcc/config/csky/csky_insn_fpu.md    (revision 266023)
+++ gcc/config/csky/csky_insn_fpu.md    (working copy)
@@ -131,7 +131,7 @@
   [(set (match_operand:SF                 0 "register_operand" "=v")
        (mult:SF (neg:SF (match_operand:SF 1 "register_operand" "%v"))
                 (match_operand:SF         2 "register_operand" "v")))]
-  "CSKY_ISA_FEATURE (fpv2_sf)"
+  "CSKY_ISA_FEATURE (fpv2_sf) && !flag_rounding_math"
   "fnmuls\t%0, %1, %2")
 
 (define_insn "*fpuv2_nmulsf3_2"
@@ -145,7 +145,7 @@
   [(set (match_operand:DF                 0 "register_operand" "=v")
        (mult:DF (neg:DF (match_operand:DF 1 "register_operand" "%v"))
                 (match_operand:DF         2 "register_operand" "v")))]
- "CSKY_ISA_FEATURE (fpv2_df)"
+ "CSKY_ISA_FEATURE (fpv2_df) && !flag_rounding_math"
  "fnmuld\t%0, %1, %2")
 
 (define_insn "*fpuv2_nmuldf3_2"
Index: gcc/testsuite/ChangeLog
===================================================================
--- gcc/testsuite/ChangeLog     (revision 266023)
+++ gcc/testsuite/ChangeLog     (working copy)
@@ -1,3 +1,10 @@
+2018-11-11  Xianmiao Qu  <xianmiao...@c-sky.com>
+
+       * gcc.target/csky/fnmul-1.c: New.
+       * gcc.target/csky/fnmul-2.c: New.
+       * gcc.target/csky/fnmul-3.c: New.
+       * gcc.target/csky/fnmul-4.c: New.
+
 2018-11-11  Uros Bizjak  <ubiz...@gmail.com>
 
        PR target/87928
Index: gcc/testsuite/gcc.target/csky/fnmul-1.c
===================================================================
--- gcc/testsuite/gcc.target/csky/fnmul-1.c     (nonexistent)
+++ gcc/testsuite/gcc.target/csky/fnmul-1.c     (working copy)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-mcpu=ck810f -mhard-float -O2" } */
+
+double
+fnmuld (double a, double b)
+{
+  /* { dg-final { scan-assembler "fnmuld" } } */
+  return -a * b;
+}
+
+float
+fnmuls (float a, float b)
+{
+  /* { dg-final { scan-assembler "fnmuls" } } */
+  return -a * b;
+}
+
Index: gcc/testsuite/gcc.target/csky/fnmul-2.c
===================================================================
--- gcc/testsuite/gcc.target/csky/fnmul-2.c     (nonexistent)
+++ gcc/testsuite/gcc.target/csky/fnmul-2.c     (working copy)
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-mcpu=ck810f -mhard-float -O2 -frounding-math" } */
+
+double
+fnmuld (double a, double b)
+{
+  /* { dg-final { scan-assembler "fnegd" } } */
+  /* { dg-final { scan-assembler "fmuld" } } */
+  return -a * b;
+}
+
+float
+fnmuls (float a, float b)
+{
+  /* { dg-final { scan-assembler "fnegs" } } */
+  /* { dg-final { scan-assembler "fmuls" } } */
+  return -a * b;
+}
+
Index: gcc/testsuite/gcc.target/csky/fnmul-3.c
===================================================================
--- gcc/testsuite/gcc.target/csky/fnmul-3.c     (nonexistent)
+++ gcc/testsuite/gcc.target/csky/fnmul-3.c     (working copy)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-mcpu=ck810f -mhard-float -O2" } */
+
+double
+fnmuld (double a, double b)
+{
+  /* { dg-final { scan-assembler "fnmuld" } } */
+  return -(a * b);
+}
+
+float
+fnmuls (float a, float b)
+{
+  /* { dg-final { scan-assembler "fnmuls" } } */
+  return -(a * b);
+}
+
Index: gcc/testsuite/gcc.target/csky/fnmul-4.c
===================================================================
--- gcc/testsuite/gcc.target/csky/fnmul-4.c     (nonexistent)
+++ gcc/testsuite/gcc.target/csky/fnmul-4.c     (working copy)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-mcpu=ck810f -mhard-float -O2 -frounding-math" } */
+
+double
+fnmuld (double a, double b)
+{
+  /* { dg-final { scan-assembler "fnmuld" } } */
+  return -(a * b);
+}
+
+float
+fnmuls (float a, float b)
+{
+  /* { dg-final { scan-assembler "fnmuls" } } */
+  return -(a * b);
+}
+