https://gcc.gnu.org/g:46f796fe2aff30e8509998c0c4c5dcdeeb1f3715
commit 46f796fe2aff30e8509998c0c4c5dcdeeb1f3715
Author: Michael Meissner <meiss...@linux.ibm.com>
Date: Tue Jul 29 13:52:47 2025 -0400
Revert changes
Diff:
---
gcc/config/rs6000/predicates.md | 11 +--
gcc/config/rs6000/rs6000-protos.h | 24 +------
gcc/config/rs6000/rs6000.cc | 44 +++---------
gcc/config/rs6000/rs6000.h | 10 +--
gcc/config/rs6000/rs6000.md | 98 +++++++++++++++++++++++----
gcc/testsuite/gcc.target/powerpc/pr118541-1.c | 28 --------
gcc/testsuite/gcc.target/powerpc/pr118541-2.c | 26 -------
7 files changed, 103 insertions(+), 138 deletions(-)
diff --git a/gcc/config/rs6000/predicates.md b/gcc/config/rs6000/predicates.md
index 0c55ba26919f..647e89afb6a7 100644
--- a/gcc/config/rs6000/predicates.md
+++ b/gcc/config/rs6000/predicates.md
@@ -1460,14 +1460,15 @@
;; Return 1 if OP is a comparison operator suitable for floating point
;; vector/scalar comparisons that generate a -1/0 mask.
-;;
-;; Do not match UNEQ, UNLT, UNLE, UNGT, or UNGE since the fpmask
-;; instructions can trap on signaling NaNs.
-;;
-;; Do not match NE, LT, or LE, ifcvt.c will handle reversing the results.
(define_predicate "fpmask_comparison_operator"
(match_code "eq,gt,ge"))
+;; Return 1 if OP is a comparison operator suitable for vector/scalar
+;; comparisons that generate a 0/-1 mask (i.e. the inverse of
+;; fpmask_comparison_operator).
+(define_predicate "invert_fpmask_comparison_operator"
+ (match_code "ne,unlt,unle"))
+
;; Return 1 if OP is a comparison operation suitable for integer vector/scalar
;; comparisons that generate a -1/0 mask.
(define_predicate "vecint_comparison_operator"
diff --git a/gcc/config/rs6000/rs6000-protos.h
b/gcc/config/rs6000/rs6000-protos.h
index d0a59f8006fe..4619142d197b 100644
--- a/gcc/config/rs6000/rs6000-protos.h
+++ b/gcc/config/rs6000/rs6000-protos.h
@@ -114,30 +114,8 @@ extern const char *rs6000_sibcall_template (rtx *,
unsigned int);
extern const char *rs6000_indirect_call_template (rtx *, unsigned int);
extern const char *rs6000_indirect_sibcall_template (rtx *, unsigned int);
extern const char *rs6000_pltseq_template (rtx *, int);
-
-/* Whether we can reverse the sense of a comparison.
-
- If the comparison involves UNEQ, LTGT, UNGT, UNGE, UNLT, and UNLE
- comparisons we cannot generate instructions that could generate a trap with
- a signaling NaN. These comprisons are created using the floating point
- relational tests (like isgreater, isless, etc.), and these comparisons must
- not trap on any value like a signaling NaN. The fpmask instructions
- (XSCMPEQDP, XSCMPGTQP, etc.) that do the comparison and produce 1's or 0's
- to allow the XXSEL instruction to do a conditional move.
-
- However, if we are not generating fpmask instructions, we have to allow
- doing the reversals. We need this reversal to handle condition jumps that
- are too far away to jump to directly and we have to reverse the jump, so we
- can generate a jump around an unconditional jump. */
-
-enum class rev_cond_allowed {
- reverse_ok,
- no_reverse
-};
-
extern enum rtx_code rs6000_reverse_condition (machine_mode,
- enum rtx_code,
- enum rev_cond_allowed);
+ enum rtx_code);
extern rtx rs6000_emit_eqne (machine_mode, rtx, rtx, rtx);
extern rtx rs6000_emit_fp_cror (rtx_code, machine_mode, rtx);
extern void rs6000_emit_sCOND (machine_mode, rtx[]);
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index ebc1af993b6b..f4f0ad80e35e 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -15282,36 +15282,17 @@ rs6000_print_patchable_function_entry (FILE *file,
}
enum rtx_code
-rs6000_reverse_condition (machine_mode mode,
- enum rtx_code code,
- enum rev_cond_allowed do_reverse)
+rs6000_reverse_condition (machine_mode mode, enum rtx_code code)
{
/* Reversal of FP compares takes care -- an ordered compare
- becomes an unordered compare and vice versa.
-
- Do not allow reversing comparisons if this is an IEEE comparison that must
- not trap. We do allow the comparsion to be reversed for explicit jumps
- when rev_cond_allowed::reverse_ok is passed. */
- if (mode == CCFPmode)
- {
- /* If NaNs are allowed, don't allow the reversal of floating point
- comparisons when the comparison is used in the context of a floating
- point conditional move when no_ordered is passed. We do allow the
- comparsion to be reversed for explicit jumps when ordered_ok is
- passed. */
- if (!flag_finite_math_only)
- return (do_reverse == rev_cond_allowed::no_reverse
- ? UNKNOWN
- : reverse_condition_maybe_unordered (code));
-
- /* Explicit ordered comparisons can be reversed if NaNs are not
- allowed. */
- else if (code == UNLT || code == UNLE || code == UNGT || code == UNGE
- || code == UNEQ || code == LTGT)
- return reverse_condition_maybe_unordered (code);
- }
-
- return reverse_condition (code);
+ becomes an unordered compare and vice versa. */
+ if (mode == CCFPmode
+ && (!flag_finite_math_only
+ || code == UNLT || code == UNLE || code == UNGT || code == UNGE
+ || code == UNEQ || code == LTGT))
+ return reverse_condition_maybe_unordered (code);
+ else
+ return reverse_condition (code);
}
/* Check if C (as 64bit integer) can be rotated to a constant which constains
@@ -15921,14 +15902,11 @@ rs6000_emit_sCOND (machine_mode mode, rtx operands[])
rtx not_result = gen_reg_rtx (CCEQmode);
rtx not_op, rev_cond_rtx;
machine_mode cc_mode;
- rtx_code rev;
cc_mode = GET_MODE (XEXP (condition_rtx, 0));
- rev = rs6000_reverse_condition (cc_mode, cond_code,
- rev_cond_allowed::no_reverse);
- rev_cond_rtx = gen_rtx_fmt_ee (rev, SImode, XEXP (condition_rtx, 0),
- const0_rtx);
+ rev_cond_rtx = gen_rtx_fmt_ee (rs6000_reverse_condition (cc_mode,
cond_code),
+ SImode, XEXP (condition_rtx, 0),
const0_rtx);
not_op = gen_rtx_COMPARE (CCEQmode, rev_cond_rtx, const0_rtx);
emit_insn (gen_rtx_SET (not_result, not_op));
condition_rtx = gen_rtx_EQ (VOIDmode, not_result, const0_rtx);
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 02343ac0149a..cffe2750ba9a 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -1804,17 +1804,11 @@ extern scalar_int_mode rs6000_pmode;
/* Can the condition code MODE be safely reversed? This is safe in
all cases on this port, because at present it doesn't use the
- trapping FP comparisons (fcmpo).
-
- However, this is not safe for IEEE comparisons (i.e. isgreater, etc.)
- starting with the power9 because ifcvt.cc will want to create a fp cmove,
- and the x{s,v}cmp{eq,gt,ge}{dp,qp} instructions will trap if one of the
- arguments is a signalling NaN. */
+ trapping FP comparisons (fcmpo). */
#define REVERSIBLE_CC_MODE(MODE) 1
/* Given a condition code and a mode, return the inverse condition. */
-#define REVERSE_CONDITION(CODE, MODE) \
- rs6000_reverse_condition (MODE, CODE, rev_cond_allowed::no_reverse)
+#define REVERSE_CONDITION(CODE, MODE) rs6000_reverse_condition (MODE, CODE)
/* Target cpu costs. */
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 148fd374a4a5..5a56ad79a9ee 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -5779,6 +5779,43 @@
[(set_attr "length" "8")
(set_attr "type" "vecperm")])
+;; Handle inverting the fpmask comparisons.
+(define_insn_and_split "*mov<SFDF:mode><SFDF2:mode>cc_invert_p9"
+ [(set (match_operand:SFDF 0 "vsx_register_operand" "=&wa,wa")
+ (if_then_else:SFDF
+ (match_operator:CCFP 1 "invert_fpmask_comparison_operator"
+ [(match_operand:SFDF2 2 "vsx_register_operand" "wa,wa")
+ (match_operand:SFDF2 3 "vsx_register_operand" "wa,wa")])
+ (match_operand:SFDF 4 "vsx_register_operand" "wa,wa")
+ (match_operand:SFDF 5 "vsx_register_operand" "wa,wa")))
+ (clobber (match_scratch:V2DI 6 "=0,&wa"))]
+ "TARGET_P9_MINMAX"
+ "#"
+ "&& 1"
+ [(set (match_dup 6)
+ (if_then_else:V2DI (match_dup 9)
+ (match_dup 7)
+ (match_dup 8)))
+ (set (match_dup 0)
+ (if_then_else:SFDF (ne (match_dup 6)
+ (match_dup 8))
+ (match_dup 5)
+ (match_dup 4)))]
+{
+ rtx op1 = operands[1];
+ enum rtx_code cond = reverse_condition_maybe_unordered (GET_CODE (op1));
+
+ if (GET_CODE (operands[6]) == SCRATCH)
+ operands[6] = gen_reg_rtx (V2DImode);
+
+ operands[7] = CONSTM1_RTX (V2DImode);
+ operands[8] = CONST0_RTX (V2DImode);
+
+ operands[9] = gen_rtx_fmt_ee (cond, CCFPmode, operands[2], operands[3]);
+}
+ [(set_attr "length" "8")
+ (set_attr "type" "vecperm")])
+
(define_insn "*fpmask<mode>"
[(set (match_operand:V2DI 0 "vsx_register_operand" "=wa")
(if_then_else:V2DI
@@ -5847,6 +5884,43 @@
[(set_attr "length" "8")
(set_attr "type" "vecperm")])
+;; Handle inverting the fpmask comparisons.
+(define_insn_and_split "*mov<mode>cc_invert_p10"
+ [(set (match_operand:IEEE128 0 "altivec_register_operand" "=&v,v")
+ (if_then_else:IEEE128
+ (match_operator:CCFP 1 "invert_fpmask_comparison_operator"
+ [(match_operand:IEEE128 2 "altivec_register_operand" "v,v")
+ (match_operand:IEEE128 3 "altivec_register_operand" "v,v")])
+ (match_operand:IEEE128 4 "altivec_register_operand" "v,v")
+ (match_operand:IEEE128 5 "altivec_register_operand" "v,v")))
+ (clobber (match_scratch:V2DI 6 "=0,&v"))]
+ "TARGET_POWER10 && TARGET_FLOAT128_HW"
+ "#"
+ "&& 1"
+ [(set (match_dup 6)
+ (if_then_else:V2DI (match_dup 9)
+ (match_dup 7)
+ (match_dup 8)))
+ (set (match_dup 0)
+ (if_then_else:IEEE128 (ne (match_dup 6)
+ (match_dup 8))
+ (match_dup 5)
+ (match_dup 4)))]
+{
+ rtx op1 = operands[1];
+ enum rtx_code cond = reverse_condition_maybe_unordered (GET_CODE (op1));
+
+ if (GET_CODE (operands[6]) == SCRATCH)
+ operands[6] = gen_reg_rtx (V2DImode);
+
+ operands[7] = CONSTM1_RTX (V2DImode);
+ operands[8] = CONST0_RTX (V2DImode);
+
+ operands[9] = gen_rtx_fmt_ee (cond, CCFPmode, operands[2], operands[3]);
+}
+ [(set_attr "length" "8")
+ (set_attr "type" "vecperm")])
+
(define_insn "*fpmask<mode>"
[(set (match_operand:V2DI 0 "altivec_register_operand" "=v")
(if_then_else:V2DI
@@ -13472,7 +13546,7 @@
;; If we are comparing the result of two comparisons, this can be done
;; using creqv or crxor.
-(define_insn_and_split "*reverse_branch_comparison"
+(define_insn_and_split ""
[(set (match_operand:CCEQ 0 "cc_reg_operand" "=y")
(compare:CCEQ (match_operator 1 "branch_comparison_operator"
[(match_operand 2 "cc_reg_operand" "y")
@@ -13494,25 +13568,19 @@
GET_MODE (operands[3]));
if (! positive_1)
- {
- rtx_code rev = rs6000_reverse_condition (GET_MODE (operands[2]),
- GET_CODE (operands[1]),
- rev_cond_allowed::reverse_ok);
- gcc_assert (rev != UNKNOWN);
- operands[1] = gen_rtx_fmt_ee (rev, SImode, operands[2], const0_rtx);
- }
+ operands[1] = gen_rtx_fmt_ee (rs6000_reverse_condition (GET_MODE
(operands[2]),
+ GET_CODE
(operands[1])),
+ SImode,
+ operands[2], const0_rtx);
else if (GET_MODE (operands[1]) != SImode)
operands[1] = gen_rtx_fmt_ee (GET_CODE (operands[1]), SImode,
operands[2], const0_rtx);
if (! positive_2)
- {
- rtx_code rev = rs6000_reverse_condition (GET_MODE (operands[4]),
- GET_CODE (operands[3]),
- rev_cond_allowed::reverse_ok);
- gcc_assert (rev != UNKNOWN);
- operands[3] = gen_rtx_fmt_ee (rev, SImode, operands[4], const0_rtx);
- }
+ operands[3] = gen_rtx_fmt_ee (rs6000_reverse_condition (GET_MODE
(operands[4]),
+ GET_CODE
(operands[3])),
+ SImode,
+ operands[4], const0_rtx);
else if (GET_MODE (operands[3]) != SImode)
operands[3] = gen_rtx_fmt_ee (GET_CODE (operands[3]), SImode,
operands[4], const0_rtx);
diff --git a/gcc/testsuite/gcc.target/powerpc/pr118541-1.c
b/gcc/testsuite/gcc.target/powerpc/pr118541-1.c
deleted file mode 100644
index 30901cd1e41d..000000000000
--- a/gcc/testsuite/gcc.target/powerpc/pr118541-1.c
+++ /dev/null
@@ -1,28 +0,0 @@
-/* { dg-do compile } */
-/* { dg-options "-mdejagnu-cpu=power9 -O2" } */
-/* { dg-require-effective-target powerpc_vsx } */
-
-/* PR target/118541 says that the IEEE comparison functions like isgreater
- should not optimize floating point conditional moves to use
- x{s,v}cmp{eq,gt,ge}{dp,qp} and xxsel since that instruction can cause traps
- if one of the arguments is a signaling NaN. */
-
-/* Verify isgreater does not generate xscmpgtdp when NaNs are allowed. */
-
-double
-ieee_compare (double a, double b, double c, double d)
-{
- /*
- * fcmpu 0,1,2
- * fmr 1,4
- * bnglr 0
- * fmr 1,3
- * blr
- */
-
- return __builtin_isgreater (a, b) ? c : d;
-}
-
-/* { dg-final { scan-assembler-not {\mxscmpg[te]dp\M} } } */
-/* { dg-final { scan-assembler-not {\mxxsel\M} } } */
-/* { dg-final { scan-assembler {\mxscmpudp\M|\mfcmpu\M} } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr118541-2.c
b/gcc/testsuite/gcc.target/powerpc/pr118541-2.c
deleted file mode 100644
index 1f36890b775f..000000000000
--- a/gcc/testsuite/gcc.target/powerpc/pr118541-2.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/* { dg-do compile } */
-/* { dg-options "-mdejagnu-cpu=power9 -O2" } */
-/* { dg-require-effective-target powerpc_vsx } */
-
-/* PR target/118541 says that the IEEE comparison functions like isgreater
- should not optimize floating point conditional moves to use
- x{s,v}cmp{eq,gt,ge}{dp,qp} and xxsel since that instruction can cause traps
- if one of the arguments is a signaling NaN. */
-
-/* Verify normal > does generate xscmpgtdp when NaNs are allowed. */
-
-double
-normal_compare (double a, double b, double c, double d)
-{
- /*
- * xscmpgtdp 1,1,2
- * xxsel 1,4,3,1
- * blr
- */
-
- return a > b ? c : d;
-}
-
-/* { dg-final { scan-assembler {\mxscmpg[te]dp\M} } } */
-/* { dg-final { scan-assembler {\mxxsel\M} } } */
-/* { dg-final { scan-assembler-not {\mxscmpudp\M|\mfcmpu\M} } } */
