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gallivm: don't try to use fast rcp for fdiv

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The use of fast rcp instruction is disabled, and will always fall back
to use a division instead (1 / x). Hence, if we get a division opcode,
it doesn't make much sense trying to split that into rcp/mul.

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Roland Scheidegger
2017-01-23 18:06:03 +01:00
parent 25208949d7
commit f4df21ed95
1 changed files with 3 additions and 1 deletions
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4
src/gallium/auxiliary/gallivm/lp_bld_arit.c
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@@ -1372,7 +1372,9 @@ lp_build_div(struct lp_build_context *bld,
return LLVMConstUDiv(a, b); return LLVMConstUDiv(a, b);
} }
if(((util_cpu_caps.has_sse && type.width == 32 && type.length == 4) || /* fast rcp is disabled (just uses div), so makes no sense to try that */
if(FALSE &&
((util_cpu_caps.has_sse && type.width == 32 && type.length == 4) ||
(util_cpu_caps.has_avx && type.width == 32 && type.length == 8)) && (util_cpu_caps.has_avx && type.width == 32 && type.length == 8)) &&
type.floating) type.floating)
return lp_build_mul(bld, a, lp_build_rcp(bld, b)); return lp_build_mul(bld, a, lp_build_rcp(bld, b));