For predictable semantics propagate the mode from operands referred by
FP substitutions to the `const_double_zero' expressions used with the
associated condition code calculation, resulting in the following update
to insn-emit.c code produced for the `pdp11-aout' target (with machine
description line numbering change noise removed):
@@ -1514,7 +1514,7 @@
gen_rtx_COMPARE (CCmode,
gen_rtx_ABS (DFmode,
operand1),
- CONST_DOUBLE_ATOF ("0", VOIDmode))),
+ CONST_DOUBLE_ATOF ("0", DFmode))),
gen_rtx_SET (operand0,
gen_rtx_ABS (DFmode,
copy_rtx (operand1)))));
@@ -1555,7 +1555,7 @@
gen_rtx_COMPARE (CCmode,
gen_rtx_NEG (DFmode,
operand1),
- CONST_DOUBLE_ATOF ("0", VOIDmode))),
+ CONST_DOUBLE_ATOF ("0", DFmode))),
gen_rtx_SET (operand0,
gen_rtx_NEG (DFmode,
copy_rtx (operand1)))));
@@ -1790,7 +1790,7 @@
gen_rtx_MULT (DFmode,
operand1,
operand2),
- CONST_DOUBLE_ATOF ("0", VOIDmode))),
+ CONST_DOUBLE_ATOF ("0", DFmode))),
gen_rtx_SET (operand0,
gen_rtx_MULT (DFmode,
copy_rtx (operand1),
@@ -1942,7 +1942,7 @@
gen_rtx_DIV (DFmode,
operand1,
operand2),
- CONST_DOUBLE_ATOF ("0", VOIDmode))),
+ CONST_DOUBLE_ATOF ("0", DFmode))),
gen_rtx_SET (operand0,
gen_rtx_DIV (DFmode,
copy_rtx (operand1),
Provide a new iterator to provide copies of FP substitutions across the
FP modes supported as the substitutions now need to match the mode of
the operands.
gcc/
* config/pdp11/pdp11.md (PDPfp): New mode iterator.
(fcc_cc, fcc_ccnz): Use it. Add mode to `const_double_zero' and
operands.
---
gcc/config/pdp11/pdp11.md | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
gcc-pdp11-const-double-zero-mode.diff
Index: gcc/gcc/config/pdp11/pdp11.md
===================================================================
--- gcc.orig/gcc/config/pdp11/pdp11.md
+++ gcc/gcc/config/pdp11/pdp11.md
@@ -82,6 +82,8 @@
(define_code_iterator SHF [ashift ashiftrt lshiftrt])
+(define_mode_iterator PDPfp [SF DF])
+
;; Substitution to turn a CC clobber into a CC setter. We have four of
;; these: for CCmode vs. CCNZmode, and for CC_REGNUM vs. FCC_REGNUM.
(define_subst "cc_cc"
@@ -101,19 +103,19 @@
(set (match_dup 0) (match_dup 1))])
(define_subst "fcc_cc"
- [(set (match_operand 0 "") (match_operand 1 ""))
+ [(set (match_operand:PDPfp 0 "") (match_operand:PDPfp 1 ""))
(clobber (reg FCC_REGNUM))]
""
[(set (reg:CC FCC_REGNUM)
- (compare:CC (match_dup 1) (const_double_zero)))
+ (compare:CC (match_dup 1) (const_double_zero:PDPfp)))
(set (match_dup 0) (match_dup 1))])
(define_subst "fcc_ccnz"
- [(set (match_operand 0 "") (match_operand 1 ""))
+ [(set (match_operand:PDPfp 0 "") (match_operand:PDPfp 1 ""))
(clobber (reg FCC_REGNUM))]
""
[(set (reg:CCNZ FCC_REGNUM)
- (compare:CCNZ (match_dup 1) (const_double_zero)))
+ (compare:CCNZ (match_dup 1) (const_double_zero:PDPfp)))
(set (match_dup 0) (match_dup 1))])
(define_subst_attr "cc_cc" "cc_cc" "_nocc" "_cc")
