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 <[email protected]>
+
+ * config/csky/csky.md (*fpuv2_nmulsf3_1, *fpuv2_nmuldf3_1): Handle
+ -frounding-math.
+
2018-11-11 Sandra Loosemore <[email protected]>
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 <[email protected]>
+
+ * 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 <[email protected]>
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);
+}
+
