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gallivm/nir: wrap idiv to avoid divide by 0 (v2)

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This code is taken from the TGSI paths, and should fix the regression
seens with GLES2

v2: use the udiv path which has d3d10 defined return.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2303>
This commit is contained in:
Dave Airlie
2019-12-13 13:09:42 +10:00
parent 7d65614422
commit c717ac1247
1 changed files with 21 additions and 4 deletions
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25
src/gallium/auxiliary/gallivm/lp_bld_nir.c
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@@ -385,6 +385,25 @@ merge_64bit(struct lp_build_nir_context *bld_base,
return LLVMBuildShuffleVector(builder, input, input2, LLVMConstVector(shuffles, len), "");
}
static LLVMValueRef
do_int_divide(struct lp_build_nir_context *bld_base,
bool is_unsigned, unsigned src_bit_size,
LLVMValueRef src, LLVMValueRef src2)
{
struct gallivm_state *gallivm = bld_base->base.gallivm;
LLVMBuilderRef builder = gallivm->builder;
struct lp_build_context *int_bld = get_int_bld(bld_base, is_unsigned, src_bit_size);
LLVMValueRef div_mask = lp_build_cmp(int_bld, PIPE_FUNC_EQUAL, src2,
int_bld->zero);
LLVMValueRef divisor = LLVMBuildOr(builder,
div_mask,
src2, "");
LLVMValueRef result = lp_build_div(int_bld, src, divisor);
/* udiv by zero is guaranteed to return 0xffffffff at least with d3d10
* may as well do same for idiv */
return LLVMBuildOr(builder, div_mask, result, "");
}
static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
nir_op op, unsigned src_bit_size[4], LLVMValueRef src[4])
{
@@ -576,8 +595,7 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
src[0], src[1]);
break;
case nir_op_idiv:
result = lp_build_div(&bld_base->int_bld,
src[0], src[1]);
result = do_int_divide(bld_base, false, src_bit_size[0], src[0], src[1]);
break;
case nir_op_ieq32:
result = icmp32(bld_base, PIPE_FUNC_EQUAL, false, src_bit_size[0], src);
@@ -660,8 +678,7 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
result = LLVMBuildZExt(builder, src[0], bld_base->uint64_bld.vec_type, "");
break;
case nir_op_udiv:
result = lp_build_div(&bld_base->uint_bld,
src[0], src[1]);
result = do_int_divide(bld_base, true, src_bit_size[0], src[0], src[1]);
break;
case nir_op_ufind_msb: {
struct lp_build_context *uint_bld = get_int_bld(bld_base, true, src_bit_size[0]);