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tcg: Fix constant folding of INDEX_op_extract2_i32

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On a 64-bit host, discard any replications of the 32-bit
sign bit when performing the shift and merge.

Backports commit 80f4d7c3ae216c191fb403e149bcba88d6aa40bb from qemu
This commit is contained in:
Richard Henderson 2019-08-08 19:24:58 -04:00 committed by Lioncash
parent 3ee580d58f
commit b2d75f4955
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1 changed files with 2 additions and 2 deletions
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4
qemu/tcg/optimize.c
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@ -1213,8 +1213,8 @@ void tcg_optimize(TCGContext *s)
if (opc == INDEX_op_extract2_i64) {
tmp = (v1 >> op->args[3]) | (v2 << (64 - op->args[3]));
} else {
tmp = (v1 >> op->args[3]) | (v2 << (32 - op->args[3]));
tmp = (int32_t)tmp;
tmp = (int32_t)(((uint32_t)v1 >> op->args[3]) |
((uint32_t)v2 << (32 - op->args[3])));
}
tcg_opt_gen_movi(s, op, op->args[0], tmp);
break;