Hi,
>From PowerPC ISA3.0, the description of `maddld RT, RA.RB, RC` is as follows:
64-bit RA and RB are multiplied and then the RC is signed extend to 128 bits,
and add them together.
We only apply it to 64-bit mode (DI) when implementing maddld. However, if we
can guarantee that the result of the maddld operation will be limited to 32-bit
mode (SI), we can still apply it to 32-bit mode (SI).
The regression testing for the patch was done on GCC mainline on
powerpc64le-unknown-linux-gnu (Power 9 LE)
with no regressions. Is it OK for trunk ?
Thanks,
Lijia He
gcc/ChangeLog
2019-06-24 Li Jia He <heli...@linux.ibm.com>
* config/rs6000/rs6000.h (TARGET_MADDLD): Remove the restriction of
TARGET_POWERPC64.
* config/rs6000/rs6000.md (maddld): Change maddld match_operand from DI
to GPR.
gcc/testsuite/ChangeLog
2019-06-24 Li Jia He <heli...@linux.ibm.com>
* gcc.target/powerpc/maddld-1.c: New testcase.
---
gcc/config/rs6000/rs6000.h | 2 +-
gcc/config/rs6000/rs6000.md | 10 +++++-----
gcc/testsuite/gcc.target/powerpc/maddld-1.c | 19 +++++++++++++++++++
3 files changed, 25 insertions(+), 6 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/powerpc/maddld-1.c
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 34fa36b6ed9..f83f19afbba 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -453,7 +453,7 @@ extern int rs6000_vector_align[];
#define TARGET_FCTIWUZ TARGET_POPCNTD
#define TARGET_CTZ TARGET_MODULO
#define TARGET_EXTSWSLI (TARGET_MODULO && TARGET_POWERPC64)
-#define TARGET_MADDLD (TARGET_MODULO && TARGET_POWERPC64)
+#define TARGET_MADDLD TARGET_MODULO
#define TARGET_XSCVDPSPN (TARGET_DIRECT_MOVE || TARGET_P8_VECTOR)
#define TARGET_XSCVSPDPN (TARGET_DIRECT_MOVE || TARGET_P8_VECTOR)
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 47cbba89443..9122b29e99b 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -3057,11 +3057,11 @@
DONE;
})
-(define_insn "*maddld4"
- [(set (match_operand:DI 0 "gpc_reg_operand" "=r")
- (plus:DI (mult:DI (match_operand:DI 1 "gpc_reg_operand" "r")
- (match_operand:DI 2 "gpc_reg_operand" "r"))
- (match_operand:DI 3 "gpc_reg_operand" "r")))]
+(define_insn "*maddld<mode>4"
+ [(set (match_operand:GPR 0 "gpc_reg_operand" "=r")
+ (plus:GPR (mult:GPR (match_operand:GPR 1 "gpc_reg_operand" "r")
+ (match_operand:GPR 2 "gpc_reg_operand" "r"))
+ (match_operand:GPR 3 "gpc_reg_operand" "r")))]
"TARGET_MADDLD"
"maddld %0,%1,%2,%3"
[(set_attr "type" "mul")])
diff --git a/gcc/testsuite/gcc.target/powerpc/maddld-1.c
b/gcc/testsuite/gcc.target/powerpc/maddld-1.c
new file mode 100644
index 00000000000..06f5f5774d4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/maddld-1.c
@@ -0,0 +1,19 @@
+/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target powerpc_p9modulo_ok } */
+/* { dg-options "-mdejagnu-cpu=power9 -O2" } */
+
+int
+s_madd (int a, int b, int c)
+{
+ return (a * b) + c;
+}
+
+unsigned int
+u_madd (unsigned int a, unsigned int b, unsigned int c)
+{
+ return (a * b) + c;
+}
+
+/* { dg-final { scan-assembler-times "maddld " 2 } } */
+/* { dg-final { scan-assembler-not "mulld " } } */
+/* { dg-final { scan-assembler-not "add " } } */
--
2.17.1
