Mesa (master): gallivm/nir: handle mod 0 better.
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gitlab-mirror at kemper.freedesktop.org
Wed Feb 26 23:36:22 UTC 2020
Module: Mesa
Branch: master
Commit: 2b155b1086121ec1d6bcd3598a835c68617d9aca
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2b155b1086121ec1d6bcd3598a835c68617d9aca
Author: Dave Airlie <airlied at redhat.com>
Date: Wed Feb 26 12:13:13 2020 +1000
gallivm/nir: handle mod 0 better.
I haven't seen this crash but TGSI does it so best align with
it to avoid future issues.
Fixes: 44a6b0107b3J (gallivm: add nir->llvm translation (v2))
Reviewed-by: Roland Scheidegger <sroland at vmware.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3956>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3956>
---
src/gallium/auxiliary/gallivm/lp_bld_nir.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_nir.c b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
index c9f67226dcc..5e47aaaadca 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_nir.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
@@ -411,6 +411,23 @@ do_int_divide(struct lp_build_nir_context *bld_base,
return LLVMBuildOr(builder, div_mask, result, "");
}
+static LLVMValueRef
+do_int_mod(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_mod(int_bld, src, divisor);
+ 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[NIR_MAX_VEC_COMPONENTS], LLVMValueRef src[NIR_MAX_VEC_COMPONENTS])
{
@@ -660,8 +677,7 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
src[0], src[1]);
break;
case nir_op_irem:
- result = lp_build_mod(get_int_bld(bld_base, false, src_bit_size[0]),
- src[0], src[1]);
+ result = do_int_mod(bld_base, false, src_bit_size[0], src[0], src[1]);
break;
case nir_op_ishl: {
struct lp_build_context *uint_bld = get_int_bld(bld_base, true, src_bit_size[0]);
@@ -757,7 +773,7 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
result = lp_build_min(get_int_bld(bld_base, true, src_bit_size[0]), src[0], src[1]);
break;
case nir_op_umod:
- result = lp_build_mod(get_int_bld(bld_base, true, src_bit_size[0]), src[0], src[1]);
+ result = do_int_mod(bld_base, true, src_bit_size[0], src[0], src[1]);
break;
case nir_op_umul_high: {
LLVMValueRef hi_bits;
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