GCC maintainers:
Version 2, renamed the built-in instances. Changed the name of the
overloaded built-in. Added the missing documentation for the new
built-ins. Fixed typos. Changed name of the test. Updated the
effective target for the test. Retested the patch on Power 10LE and
Power 8 and Power 9.
The following patch adds four built-ins for the decimal floating point
(DFP) quantize instructions on rs6000. The built-ins are for 64-bit
and 128-bit DFP operands.
The patch also adds a test case for the new builtins.
The Patch has been tested on Power 10LE and Power 9 LE/BE.
Please let me know if the patch is acceptable for mainline. Thanks.
Carl Love
--------------------------------------------------
[PATCH] rs6000, add overloaded DFP quantize support
Add decimal floating point (DFP) quantize built-ins for both 64-bit DFP
and 128-DFP operands. In each case, there is an immediate version and a
variable version of the built-in. The RM value is a 2-bit constant int
which specifies the rounding mode to use. For the immediate versions of
the built-in, the TE field is a 5-bit constant that specifies the value of
the ideal exponent for the result. The built-in specifications are:
__Decimal64 builtin_dfp_quantize (_Decimal64, _Decimal64,
const int RM)
__Decimal64 builtin_dfp_quantize (const int TE, _Decimal64,
const int)
__Decimal128 builtin_dfp_quantize (_Decimal128, _Decimal128,
const int RM)
__Decimal128 builtin_dfp_quantize (const int TE, _Decimal128,
const int)
A testcase is added for the new built-in definitions.
gcc/ChangeLog:
* config/rs6000/dfp.md: New UNSPECDQUAN.
(dfp_quan_<mode>, dfp_quan_i<mode>): New define_insn.
* config/rs6000/rs6000-builtins.def (__builtin_dfp_quantize_64,
__builtin_dfp_quantize_64i, __builtin_dfp_quantize_128,
__builtin_dfp_quantize_128i): New buit-in definitions.
* config/rs6000/rs6000-overload.def (__builtin_dfp_quantize,
__builtin_dfpq_quantize): New overloaded definitions.
gcc/testsuite/
* gcc.target/powerpc/builtin-dfp-quantize-runnable.c: New test
case.
---
gcc/config/rs6000/dfp.md | 25 ++-
gcc/config/rs6000/rs6000-builtins.def | 15 ++
gcc/config/rs6000/rs6000-overload.def | 10 +
gcc/doc/extend.texi | 15 ++
.../gcc.target/powerpc/pr93448-dfp-quantize.c | 199 ++++++++++++++++++
5 files changed, 263 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr93448-dfp-quantize.c
diff --git a/gcc/config/rs6000/dfp.md b/gcc/config/rs6000/dfp.md
index 5ed8a73ac51..abd21c5db75 100644
--- a/gcc/config/rs6000/dfp.md
+++ b/gcc/config/rs6000/dfp.md
@@ -271,7 +271,8 @@
UNSPEC_DIEX
UNSPEC_DSCLI
UNSPEC_DTSTSFI
- UNSPEC_DSCRI])
+ UNSPEC_DSCRI
+ UNSPEC_DQUAN])
(define_code_iterator DFP_TEST [eq lt gt unordered])
@@ -395,3 +396,25 @@
"dscri<q> %0,%1,%2"
[(set_attr "type" "dfp")
(set_attr "size" "<bits>")])
+
+(define_insn "dfp_dquan_<mode>"
+ [(set (match_operand:DDTD 0 "gpc_reg_operand" "=d")
+ (unspec:DDTD [(match_operand:DDTD 1 "gpc_reg_operand" "d")
+ (match_operand:DDTD 2 "gpc_reg_operand" "d")
+ (match_operand:QI 3 "immediate_operand" "i")]
+ UNSPEC_DQUAN))]
+ "TARGET_DFP"
+ "dqua<q> %0,%1,%2,%3"
+ [(set_attr "type" "dfp")
+ (set_attr "size" "<bits>")])
+
+(define_insn "dfp_dquan_i<mode>"
+ [(set (match_operand:DDTD 0 "gpc_reg_operand" "=d")
+ (unspec:DDTD [(match_operand:SI 1 "const_int_operand" "n")
+ (match_operand:DDTD 2 "gpc_reg_operand" "d")
+ (match_operand:SI 3 "immediate_operand" "i")]
+ UNSPEC_DQUAN))]
+ "TARGET_DFP"
+ "dquai<q> %1,%0,%2,%3"
+ [(set_attr "type" "dfp")
+ (set_attr "size" "<bits>")])
diff --git a/gcc/config/rs6000/rs6000-builtins.def
b/gcc/config/rs6000/rs6000-builtins.def
index 8a294d6c934..a7ab90771f9 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -2983,6 +2983,21 @@
const unsigned long long __builtin_unpack_dec128 (_Decimal128, const int<1>);
UNPACK_TD unpacktd {}
+ const _Decimal64 __builtin_dfp_dqua (_Decimal64, _Decimal64, \
+ const int<2>);
+ DFPQUAN_64 dfp_dquan_dd {}
+
+ const _Decimal64 __builtin_dfp_dquai (const int<5>, _Decimal64, \
+ const int<2>);
+ DFPQUAN_64i dfp_dquan_idd {}
+
+ const _Decimal128 __builtin_dfp_dquaq (_Decimal128, _Decimal128, \
+ const int<2>);
+ DFPQUAN_128 dfp_dquan_td {}
+
+ const _Decimal128 __builtin_dfp_dquaqi (const int<5>, _Decimal128, \
+ const int<2>);
+ DFPQUAN_128i dfp_dquan_itd {}
[crypto]
const vull __builtin_crypto_vcipher (vull, vull);
diff --git a/gcc/config/rs6000/rs6000-overload.def
b/gcc/config/rs6000/rs6000-overload.def
index b83946f5ad8..38d92fcf1f0 100644
--- a/gcc/config/rs6000/rs6000-overload.def
+++ b/gcc/config/rs6000/rs6000-overload.def
@@ -195,6 +195,16 @@
unsigned long long __builtin_cmpb (unsigned long long, unsigned long long);
CMPB
+[DFPQUAN, dfp_quantize, __builtin_dfp_quantize]
+ _Decimal64 __builtin_dfp_quantize (_Decimal64, _Decimal64, const int);
+ DFPQUAN_64
+ _Decimal64 __builtin_dfp_quantize (const int, _Decimal64, const int);
+ DFPQUAN_64i
+ _Decimal128 __builtin_dfp_quantize (_Decimal128, _Decimal128, const int);
+ DFPQUAN_128
+ _Decimal128 __builtin_dfp_quantize (const int, _Decimal128, const int);
+ DFPQUAN_128i
+
[VEC_ABS, vec_abs, __builtin_vec_abs]
vsc __builtin_vec_abs (vsc);
ABS_V16QI
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 73a997276cb..b3b92bf0632 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -18566,6 +18566,21 @@ The builtin uses the ISA 3.0 instruction
@code{mffscdrn} if available.
Otherwise the builtin reads the FPSCR, masks the current decimal rounding
mode bits out and OR's in the new value.
+_Decimal64 __builtin_dfp_quantize (_Decimal64, _Decimal64, const int);
+_Decimal64 __builtin_dfp_quantize (const int, _Decimal64, const int);
+_Decimal128 __builtin_dfp_quantize (_Decimal128, _Decimal128, const int);
+_Decimal128 __builtin_dfp_quantize (const int, _Decimal128, const int);
+
+The @code{__builtin_dfp_quantize} built-in, converts and rounds the second
+argument to the form with the same exponent as that of the first operand.
+If the first argument is a constant int, then the 5-bit value in the second
+argument is converted and rounded to the form with the exponent specified by
+the 5-bit const int value in the first argument. The third argument, constant
+int, is a two bit field that specifies the rounding mode. The possible modes
+are: 00 Round to nearest, ties to even; 01 Round toward 0; 10 Round to nearest,
+ties away from 0; 11 Round according to DRN where DRN is the Decimal Floating
+point field of the FPSCR.
+
@end smallexample
The following functions require @option{-mhard-float},
diff --git a/gcc/testsuite/gcc.target/powerpc/pr93448-dfp-quantize.c
b/gcc/testsuite/gcc.target/powerpc/pr93448-dfp-quantize.c
new file mode 100644
index 00000000000..9a6a1fdaea0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr93448-dfp-quantize.c
@@ -0,0 +1,199 @@
+/* { dg-do run } */
+/* { dg-require-effective-target dfp_hw} */
+/* { dg-require-effective-target has_arch_pwr6} */
+/* { dg-options "-mhard-float -O2 -save-temps" } */
+
+
+#define DEBUG 0
+
+#ifdef DEBUG
+#include <stdio.h>
+#endif
+#include <float.h>
+
+void abort (void);
+
+int main()
+{
+#define IMM2 2
+#define IMM3 3
+#define IMM4 4
+
+ _Decimal64 srcA_dfp64, srcB_dfp64;
+ _Decimal64 result_dfp64;
+ _Decimal64 expected_result_dfp64;
+ _Decimal128 srcA_dfp128, srcB_dfp128;
+ _Decimal128 result_dfp128;
+ _Decimal128 expected_result_dfp128;
+
+ /* Third argument of quantize built-ins is the rounding mode value (RMC).
+
+ RMC Rounding Mode
+ 00 Round to nearest, ties to even
+ 01 Round toward 0
+ 10 Round to nearest, ties toward 0
+ 11 Round according to DRN */
+
+
+ /* Tests for quantize with 64-bit DFP variable. */
+ srcA_dfp64 = 100.0df;
+ srcB_dfp64 = 300.456789df;
+ expected_result_dfp64 = 300.5df;
+
+ result_dfp64 = __builtin_dfp_quantize (srcA_dfp64, srcB_dfp64, 0x0);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize of variable, RMC = 0 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcA_dfp64 = 100.00df;
+ srcB_dfp64 = 300.456789df;
+ expected_result_dfp64 = 300.45df;
+
+ result_dfp64 = __builtin_dfp_quantize (srcA_dfp64, srcB_dfp64, 0x1);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize of variable, RMC = 1 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcA_dfp64 = 100.001df;
+ srcB_dfp64 = 3001.456789df;
+ expected_result_dfp64 = 3001.457df;
+
+ result_dfp64 = __builtin_dfp_quantize (srcA_dfp64, srcB_dfp64, 0x2);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize of variable, RMC = 2 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ /* Tests for 64-bit quantize with immediate value. */
+
+ srcB_dfp64 = 10.4567df;
+ expected_result_dfp64 = 000.0df;
+
+ result_dfp64 = __builtin_dfp_quantize (IMM2, srcB_dfp64, 0x0);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize immediate, RMC = 0 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcB_dfp64 = 104567.891df;
+ expected_result_dfp64 = 100000.0df;
+
+ result_dfp64 = __builtin_dfp_quantize (IMM4, srcB_dfp64, 0x1);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize immediate, RMC = 1 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcB_dfp64 = 109876.54321df;
+ expected_result_dfp64 = 109900.0df;
+
+ result_dfp64 = __builtin_dfp_quantize (IMM2, srcB_dfp64, 0x2);
+
+ if (result_dfp64 != expected_result_dfp64)
+#if DEBUG
+ printf("DFP 64-bit quantize immediate, RMC = 2 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ /* Tests for quantize 128-bit DFP variable. */
+ srcA_dfp128 = 0.018df;
+ srcB_dfp128 = 50000.18345df;
+ expected_result_dfp128 = 50000.180df;
+
+ result_dfp128 = __builtin_dfp_quantize (srcA_dfp128, srcB_dfp128, 0x0);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize variable, RMC = 0 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcA_dfp128 = 8.01df;
+ srcB_dfp128 = 50000.18345df;
+ expected_result_dfp128 = 50000.18df;
+
+ result_dfp128 = __builtin_dfp_quantize (srcA_dfp128, srcB_dfp128, 0x1);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize variable, RMC = 1 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcA_dfp128 = 0.1234df;
+ srcB_dfp128 = 50000.18346789df;
+ expected_result_dfp128 = 50000.1800df;
+
+ result_dfp128 = __builtin_dfp_quantize (srcA_dfp128, srcB_dfp128, 0x2);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize variable, RMC = 2 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ /* Tests for 128-bit quantize with immediate value. */
+ srcB_dfp128 = 1234.18345df;
+ expected_result_dfp128 = 1200.0df;
+
+ result_dfp128 = __builtin_dfp_quantize (IMM2, srcB_dfp128, 0x0);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize immediate, RMC = 0 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcB_dfp128 = 123456.18345df;
+ expected_result_dfp128 = 120000.0df;
+
+ result_dfp128 = __builtin_dfp_quantize (IMM4, srcB_dfp128, 0x1);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize immediate, RMC = 1 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ srcB_dfp128 = 12361834.5df;
+ expected_result_dfp128 = 12362000.0df;
+
+ result_dfp128 = __builtin_dfp_quantize (IMM3, srcB_dfp128, 0x2);
+
+ if (result_dfp128 != expected_result_dfp128)
+#if DEBUG
+ printf("DFP 128-bit quantize immediate, RMC = 2 result does not match
expected result\n");
+#else
+ abort();
+#endif
+
+ return 0;
+}
+
+/* { dg-final { scan-assembler-times {\mdqua\M} 3 } } */
+/* { dg-final { scan-assembler-times {\mdquai\M} 3 } } */
+/* { dg-final { scan-assembler-times {\mdquaq\M} 3 } } */
+/* { dg-final { scan-assembler-times {\mdquaiq\M} 3 } } */
--
2.37.2
