aaron/ispc
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Stop factoring out constant offsets for gather/scatter if instr is available.

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For KNC (gather/scatter), it's not helpful to factor base+offsets gathers
and scatters into base_ptr + {1/2/4/8} * varying_offsets + const_offsets.
Now, if a HW instruction is available for gather/scatter, we just factor
into base + {1/2/4/8} * offsets (if possible).  Not only is this simpler,
but it's also what we need to pass a value along to the scale by
2/4/8 available directly in those instructions.

Finishes issue #325.
This commit is contained in:
Matt Pharr
2012-07-11 14:52:14 -07:00
parent c09c87873e
commit 216ac4b1a4
7 changed files with 257 additions and 336 deletions
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5
ispc.cpp
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@@ -254,6 +254,7 @@ Target::GetTarget(const char *arch, const char *cpu, const char *isa,
t->maskBitCount = 1;
t->hasHalf = true;
t->hasTranscendentals = true;
t->hasGather = t->hasScatter = true;
}
else if (!strcasecmp(isa, "generic-8")) {
t->isa = Target::GENERIC;
@@ -263,6 +264,7 @@ Target::GetTarget(const char *arch, const char *cpu, const char *isa,
t->maskBitCount = 1;
t->hasHalf = true;
t->hasTranscendentals = true;
t->hasGather = t->hasScatter = true;
}
else if (!strcasecmp(isa, "generic-16")) {
t->isa = Target::GENERIC;
@@ -272,6 +274,7 @@ Target::GetTarget(const char *arch, const char *cpu, const char *isa,
t->maskBitCount = 1;
t->hasHalf = true;
t->hasTranscendentals = true;
t->hasGather = t->hasScatter = true;
}
else if (!strcasecmp(isa, "generic-32")) {
t->isa = Target::GENERIC;
@@ -281,6 +284,7 @@ Target::GetTarget(const char *arch, const char *cpu, const char *isa,
t->maskBitCount = 1;
t->hasHalf = true;
t->hasTranscendentals = true;
t->hasGather = t->hasScatter = true;
}
else if (!strcasecmp(isa, "generic-64")) {
t->isa = Target::GENERIC;
@@ -290,6 +294,7 @@ Target::GetTarget(const char *arch, const char *cpu, const char *isa,
t->maskBitCount = 1;
t->hasHalf = true;
t->hasTranscendentals = true;
t->hasGather = t->hasScatter = true;
}
else if (!strcasecmp(isa, "generic-1")) {
t->isa = Target::GENERIC;