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nir: fix interger divide by zero crash during constant folding 

From the GLSL 4.60 spec Section 5.9 (Expressions):

   "Dividing by zero does not cause an exception but does result in
    an unspecified value."

Fixes: 89285e4d47 "nir: add new constant folding infrastructure"

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105271
This commit is contained in:
Timothy Arceri 2018-02-28 14:33:55 +11:00
parent 086c88551d
commit 0c1f37cc2d
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opcodes.py
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@ -404,8 +404,8 @@ binop("umul_high", tuint32, commutative,
"(uint32_t)(((uint64_t) src0 * (uint64_t) src1) >> 32)")
binop("fdiv", tfloat, "", "src0 / src1")
binop("idiv", tint, "", "src0 / src1")
binop("udiv", tuint, "", "src0 / src1")
binop("idiv", tint, "", "src1 == 0 ? 0 : (src0 / src1)")
binop("udiv", tuint, "", "src1 == 0 ? 0 : (src0 / src1)")
# returns a boolean representing the carry resulting from the addition of
# the two unsigned arguments.