| From b066cb189302814fcd91b38f2f9da830a2c5b8fe Mon Sep 17 00:00:00 2001 |
| From: Mahesh Bodapati <mbodapat@xilinx.com> |
| Date: Tue, 17 Jan 2017 18:07:24 +0530 |
| Subject: [PATCH 22/58] [PATCH] microblaze.md: Improve 'adddi3' and 'subdi3' |
| insn definitions |
| |
| Change adddi3 to handle DI immediates as the second operand, this |
| requires modification to the output template however reduces the need to |
| specify seperate templates for 16-bit positive/negative immediate |
| operands. The use of 32-bit immediates for the addi and addic |
| instructions is handled by the assembler, which will emit the imm |
| instructions when required. This conveniently handles the optimizable |
| cases where the immediate constant value does not need the higher half |
| words of the operands upper/lower words. |
| |
| Change the constraints of the subdi3 instruction definition such that it |
| does not match the second operand as an immediate value. This is because |
| there is no definition to handle this case nor is it possible to |
| implement purely with instructions as microblaze does not provide an |
| instruction to perform a forward arithmetic subtraction (it only |
| provides reverse 'rD = IMM - rA'). |
| |
| Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> |
| --- |
| gcc/config/microblaze/microblaze.md | 13 ++++++------- |
| 1 file changed, 6 insertions(+), 7 deletions(-) |
| |
| diff --git a/gcc/config/microblaze/microblaze.md b/gcc/config/microblaze/microblaze.md |
| index 986d9c3aa25..efd2c34e0b7 100644 |
| --- a/gcc/config/microblaze/microblaze.md |
| +++ b/gcc/config/microblaze/microblaze.md |
| @@ -502,17 +502,16 @@ |
| ;; Adding 2 DI operands in register or reg/imm |
| |
| (define_insn "adddi3" |
| - [(set (match_operand:DI 0 "register_operand" "=d,d,d") |
| - (plus:DI (match_operand:DI 1 "register_operand" "%d,d,d") |
| - (match_operand:DI 2 "arith_operand32" "d,P,N")))] |
| + [(set (match_operand:DI 0 "register_operand" "=d,d") |
| + (plus:DI (match_operand:DI 1 "register_operand" "%d,d") |
| + (match_operand:DI 2 "arith_operand" "d,i")))] |
| "" |
| "@ |
| add\t%L0,%L1,%L2\;addc\t%M0,%M1,%M2 |
| - addi\t%L0,%L1,%2\;addc\t%M0,%M1,r0 |
| - addi\t%L0,%L1,%2\;addc\t%M0,%M1,r0\;addi\t%M0,%M0,-1" |
| + addi\t%L0,%L1,%j2\;addic\t%M0,%M1,%h2" |
| [(set_attr "type" "darith") |
| (set_attr "mode" "DI") |
| - (set_attr "length" "8,8,12")]) |
| + (set_attr "length" "8,8")]) |
| |
| ;;---------------------------------------------------------------- |
| ;; Subtraction |
| @@ -549,7 +548,7 @@ |
| (define_insn "subdi3" |
| [(set (match_operand:DI 0 "register_operand" "=&d") |
| (minus:DI (match_operand:DI 1 "register_operand" "d") |
| - (match_operand:DI 2 "arith_operand32" "d")))] |
| + (match_operand:DI 2 "register_operand" "d")))] |
| "" |
| "rsub\t%L0,%L2,%L1\;rsubc\t%M0,%M2,%M1" |
| [(set_attr "type" "darith") |
| -- |
| 2.17.1 |
| |