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nir/opcodes: Fix constant-folding of bitfield_insert

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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104119
CC: <mesa-stable@lists.freedesktop.org>
CC: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
James Legg 2017-12-06 11:55:14 +00:00 • committed by Alex Smith
parent 8fda98c4f1
commit 947470d10b
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opcodes.py
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@ -724,12 +724,12 @@ opcode("bitfield_insert", 0, tuint32, [0, 0, 0, 0],
unsigned base = src0, insert = src1;
int offset = src2, bits = src3;
if (bits == 0) {
dst = 0;
dst = base;
} else if (offset < 0 || bits < 0 || bits + offset > 32) {
dst = 0;
} else {
unsigned mask = ((1ull << bits) - 1) << offset;
dst = (base & ~mask) | ((insert << bits) & mask);
dst = (base & ~mask) | ((insert << offset) & mask);
}
""")