Hi Sam
On Monday 23 July 2018 11:39 AM, Sam Tebbs wrote:
Hi all,
This patch extends the aarch64_get_lane_zero_extendsi instruction
definition to
also cover DI mode. This prevents a redundant AND instruction from being
generated due to the pattern failing to be matched.
Example:
typedef char v16qi __attribute__ ((vector_size (16)));
unsigned long long
foo (v16qi a)
{
return a[0];
}
Previously generated:
foo:
umov w0, v0.b[0]
and x0, x0, 255
ret
And now generates:
foo:
umov w0, v0.b[0]
ret
Bootstrapped on aarch64-none-linux-gnu and tested on aarch64-none-elf
with no
regressions.
gcc/
2018-07-23 Sam Tebbs <sam.te...@arm.com>
* config/aarch64/aarch64-simd.md
(*aarch64_get_lane_zero_extendsi<mode>):
Rename to...
(*aarch64_get_lane_zero_extend<mode><VDQQH:mode>): ... This.
Use GPI iterator instead of SI mode.
gcc/testsuite
2018-07-23 Sam Tebbs <sam.te...@arm.com>
* gcc.target/aarch64/extract_zero_extend.c: New file
You will need an approval from a maintainer, but I would only add one
request to this:
diff --git a/gcc/config/aarch64/aarch64-simd.md
b/gcc/config/aarch64/aarch64-simd.md
index 89e38e6..15fb661 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -3032,15 +3032,16 @@
[(set_attr "type" "neon_to_gp<q>")]
)
-(define_insn "*aarch64_get_lane_zero_extendsi<mode>"
- [(set (match_operand:SI 0 "register_operand" "=r")
- (zero_extend:SI
+(define_insn "*aarch64_get_lane_zero_extend<mode><VDQQH:mode>"
+ [(set (match_operand:GPI 0 "register_operand" "=r")
+ (zero_extend:GPI
Since you are adding 4 new patterns with this change, could you add
more cases in your test as well to make sure you have coverage for each
of them.
Thanks
Sudi
(vec_select:<VEL>
(match_operand:VDQQH 1 "register_operand" "w")
(parallel [(match_operand:SI 2 "immediate_operand" "i")]))))]
"TARGET_SIMD"
{
- operands[2] = aarch64_endian_lane_rtx (<MODE>mode, INTVAL
(operands[2]));
+ operands[2] = aarch64_endian_lane_rtx (<VDQQH:MODE>mode,
+ INTVAL (operands[2]));
return "umov\\t%w0, %1.<Vetype>[%2]";
}
[(set_attr "type" "neon_to_gp<q>")]