diff options
Diffstat (limited to 'meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0024-PATCH-microblaze.md-Improve-adddi3-and-subdi3-insn-d.patch')
| -rw-r--r-- | meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0024-PATCH-microblaze.md-Improve-adddi3-and-subdi3-insn-d.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0024-PATCH-microblaze.md-Improve-adddi3-and-subdi3-insn-d.patch b/meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0024-PATCH-microblaze.md-Improve-adddi3-and-subdi3-insn-d.patch new file mode 100644 index 00000000..85a749e5 --- /dev/null +++ b/meta-xilinx-bsp/recipes-microblaze/gcc/gcc-8/0024-PATCH-microblaze.md-Improve-adddi3-and-subdi3-insn-d.patch @@ -0,0 +1,63 @@ +From be9c512be09fa4ef67870ab0456eb3781394dac3 Mon Sep 17 00:00:00 2001 +From: Mahesh Bodapati <mbodapat@xilinx.com> +Date: Tue, 17 Jan 2017 18:07:24 +0530 +Subject: [PATCH 24/54] [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 3a53e24..949e103 100644 +--- a/gcc/config/microblaze/microblaze.md ++++ b/gcc/config/microblaze/microblaze.md +@@ -500,17 +500,16 @@ + ;; 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 +@@ -547,7 +546,7 @@ + (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") +-- +2.7.4 + |