mirror of https://github.com/proxmox/mirror_qemu
tcg/optimize: Do not attempt to constant fold neg_vec
Split out the tail of fold_neg to fold_neg_no_const so that we
can avoid attempting to constant fold vector negate.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2150
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit e25fe886b8
)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
parent
20cd0c8655
commit
196601e759
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@ -1830,16 +1830,10 @@ static bool fold_nand(OptContext *ctx, TCGOp *op)
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return false;
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return false;
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}
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}
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static bool fold_neg(OptContext *ctx, TCGOp *op)
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static bool fold_neg_no_const(OptContext *ctx, TCGOp *op)
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{
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{
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uint64_t z_mask;
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if (fold_const1(ctx, op)) {
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return true;
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}
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/* Set to 1 all bits to the left of the rightmost. */
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/* Set to 1 all bits to the left of the rightmost. */
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z_mask = arg_info(op->args[1])->z_mask;
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uint64_t z_mask = arg_info(op->args[1])->z_mask;
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ctx->z_mask = -(z_mask & -z_mask);
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ctx->z_mask = -(z_mask & -z_mask);
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/*
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/*
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@ -1850,6 +1844,11 @@ static bool fold_neg(OptContext *ctx, TCGOp *op)
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return true;
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return true;
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}
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}
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static bool fold_neg(OptContext *ctx, TCGOp *op)
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{
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return fold_const1(ctx, op) || fold_neg_no_const(ctx, op);
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}
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static bool fold_nor(OptContext *ctx, TCGOp *op)
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static bool fold_nor(OptContext *ctx, TCGOp *op)
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{
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{
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if (fold_const2_commutative(ctx, op) ||
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if (fold_const2_commutative(ctx, op) ||
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@ -2165,7 +2164,7 @@ static bool fold_sub_to_neg(OptContext *ctx, TCGOp *op)
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if (have_neg) {
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if (have_neg) {
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op->opc = neg_op;
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op->opc = neg_op;
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op->args[1] = op->args[2];
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op->args[1] = op->args[2];
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return fold_neg(ctx, op);
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return fold_neg_no_const(ctx, op);
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}
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}
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return false;
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return false;
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}
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}
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@ -10,7 +10,7 @@ VPATH += $(AARCH64_SRC)
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# Base architecture tests
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# Base architecture tests
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AARCH64_TESTS=fcvt pcalign-a64 lse2-fault
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AARCH64_TESTS=fcvt pcalign-a64 lse2-fault
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AARCH64_TESTS += test-2248
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AARCH64_TESTS += test-2248 test-2150
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fcvt: LDFLAGS+=-lm
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fcvt: LDFLAGS+=-lm
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@ -0,0 +1,12 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* See https://gitlab.com/qemu-project/qemu/-/issues/2150 */
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int main()
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{
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asm volatile(
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"movi v6.4s, #1\n"
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"movi v7.4s, #0\n"
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"sub v6.2d, v7.2d, v6.2d\n"
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: : : "v6", "v7");
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return 0;
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}
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