Will, Segher:
This patch adds support for converting to/from 128-bit integers and
128-bit decimal floating point formats.
Version 3:
No functional changes.
Tested on Power 8BE, Power9, Power10.
Version 2:
Updated ChangeLog comments. Fixed up comments in the test program.
Re-tested the patch on Power 9 with no regression errors.
Carl
-----------------------------------------------------------
gcc/ChangeLog
2021-01-12 Carl Love <c...@us.ibm.com>
* config/rs6000/dfp.md (floattitd2, fixtdti2): New define_insns.
* config/rs6000/rs6000-call.c (P10V_BUILTIN_VCMPNET_P,
P10V_BUILTIN_VCMPAET_P): New overloaded definitions.
gcc/testsuite/ChangeLog
2021-01-12 Carl Love <c...@us.ibm.com>
* gcc.target/powerpc/int_128bit-runnable.c: Add 128-bit DFP
conversion tests.
---
gcc/config/rs6000/dfp.md | 14 +++++
.../gcc.target/powerpc/int_128bit-runnable.c | 61 +++++++++++++++++++
2 files changed, 75 insertions(+)
diff --git a/gcc/config/rs6000/dfp.md b/gcc/config/rs6000/dfp.md
index c8cdb645865..876ab2ed682 100644
--- a/gcc/config/rs6000/dfp.md
+++ b/gcc/config/rs6000/dfp.md
@@ -222,6 +222,13 @@
"dcffixq %0,%1"
[(set_attr "type" "dfp")])
+(define_insn "floattitd2"
+ [(set (match_operand:TD 0 "gpc_reg_operand" "=d")
+ (float:TD (match_operand:TI 1 "gpc_reg_operand" "v")))]
+ "TARGET_POWER10"
+ "dcffixqq %0,%1"
+ [(set_attr "type" "dfp")])
+
;; Convert a decimal64/128 to a decimal64/128 whose value is an integer.
;; This is the first stage of converting it to an integer type.
@@ -241,6 +248,13 @@
"TARGET_DFP"
"dctfix<q> %0,%1"
[(set_attr "type" "dfp")])
+
+(define_insn "fixtdti2"
+ [(set (match_operand:TI 0 "gpc_reg_operand" "=v")
+ (fix:TI (match_operand:TD 1 "gpc_reg_operand" "d")))]
+ "TARGET_POWER10"
+ "dctfixqq %0,%1"
+ [(set_attr "type" "dfp")])
;; Decimal builtin support
diff --git a/gcc/testsuite/gcc.target/powerpc/int_128bit-runnable.c
b/gcc/testsuite/gcc.target/powerpc/int_128bit-runnable.c
index 3f8892b39d6..42cb91c7ba9 100644
--- a/gcc/testsuite/gcc.target/powerpc/int_128bit-runnable.c
+++ b/gcc/testsuite/gcc.target/powerpc/int_128bit-runnable.c
@@ -38,6 +38,7 @@
#if DEBUG
#include <stdio.h>
#include <stdlib.h>
+#include <math.h>
void print_i128(__int128_t val)
@@ -59,6 +60,13 @@ int main ()
__int128_t arg1, result;
__uint128_t uarg2;
+ _Decimal128 arg1_dfp128, result_dfp128, expected_result_dfp128;
+
+ struct conv_t {
+ __uint128_t u128;
+ _Decimal128 d128;
+ } conv, conv2;
+
vector signed long long int vec_arg1_di, vec_arg2_di;
vector signed long long int vec_result_di, vec_expected_result_di;
vector unsigned long long int vec_uarg1_di, vec_uarg2_di, vec_uarg3_di;
@@ -2296,6 +2304,59 @@ int main ()
abort();
#endif
}
+
+ /* DFP to __int128 and __int128 to DFP conversions */
+ /* Print the DFP value as an unsigned int so we can see the bit patterns. */
+ conv.u128 = 0x2208000000000000ULL;
+ conv.u128 = (conv.u128 << 64) | 0x4ULL; //DFP bit pattern for integer 4
+ expected_result_dfp128 = conv.d128;
+ arg1 = 4;
+
+ conv.d128 = (_Decimal128) arg1;
+
+ result_dfp128 = (_Decimal128) arg1;
+ if (((conv.u128 >>64) != 0x2208000000000000ULL) &&
+ ((conv.u128 & 0xFFFFFFFFFFFFFFFF) != 0x4ULL)) {
+#if DEBUG
+ printf("ERROR: convert int128 value ");
+ print_i128 (arg1);
+ conv.d128 = result_dfp128;
+ printf("\nto DFP value 0x%llx %llx (printed as hex bit string) ",
+ (unsigned long long)((conv.u128) >>64),
+ (unsigned long long)((conv.u128) & 0xFFFFFFFFFFFFFFFF));
+
+ conv.d128 = expected_result_dfp128;
+ printf("\ndoes not match expected_result = 0x%llx %llx\n\n",
+ (unsigned long long) (conv.u128>>64),
+ (unsigned long long) (conv.u128 & 0xFFFFFFFFFFFFFFFF));
+#else
+ abort();
+#endif
+ }
+
+ expected_result = 4;
+
+ conv.u128 = 0x2208000000000000ULL;
+ conv.u128 = (conv.u128 << 64) | 0x4ULL; // 4 as DFP
+ arg1_dfp128 = conv.d128;
+
+ result = (__int128_t) arg1_dfp128;
+
+ if (result != expected_result) {
+#if DEBUG
+ printf("ERROR: convert DFP value ");
+ printf("0x%llx %llx (printed as hex bit string) ",
+ (unsigned long long)(conv.u128>>64),
+ (unsigned long long)(conv.u128 & 0xFFFFFFFFFFFFFFFF));
+ printf("to __int128 value = ");
+ print_i128 (result);
+ printf("\ndoes not match expected_result = ");
+ print_i128 (expected_result);
+ printf("\n");
+#else
+ abort();
+#endif
+ }
return 0;
}
--
2.27.0
